Question about 1988 Ford Thunderbird

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Spongy brakes when i was bleeding the brakes, i heard air coming from the master cylinder reservoir cap. do you think its just the cap, the master cylinder, or the brake power booster.

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Brake ;ines have air in the lines.
bleed brakes.Start with good
manul will worth more than ever
know

Posted on Dec 21, 2008

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2004 ford focus 2.0liter. clutch pedaL GOES TO FLOOR. brake master full of fluid.I clutch master or clutch slave cylinder bad?


a plastic master cyl !

master cyl is bypassing internally

slave cylinder is inside the gearbox bell housing
if its leaking .....gearbox out




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Nov 11, 2016 | 2004 Ford Focus

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1997 mercury sable gs 3.0l replaced master brake, still having brake pedal feeling spongy and slowly traveling down. i bench bled master brake and bled brake right rear left rear right then front.


If the master cylinder is replaced, care must be taken to prime the new master cylinder by removing all of the air and completely filling it with brake fluid. The spongy feeling is air that is still in the circuits. You will need to bleed the back brakes as well as the front ones again. The order that you bled them seems correct, but perhaps there remained some air in the main trunk lines.

For the best results 2 people are needed. Start at the further distance wheel cylinder and bleed at least three (3) master cylinder reservoir volumes of fluid (back brakes). Bleed the fluid with use of a piece of tubing attached to the bleed port that is long enough to reach almost to the bottom of a long neck or tall clear jar (clear drink bottle works well). When the bleeding begins, after one or two brake pedal pushes, make sure that the end of the tubing is below the surface of the fluid and keep it under. It best to have a clear bleed line (to observe air). Keep pumping the brake pedal while being careful to not completely empty the master cylinder reservoir (leave 1/4 full always). Repeat the same technique for each wheel cylinder with at least two (2) reservoirs full for front brakes. Partially close the bleed ports when almost finished (at least 5 pedal strokes without exit of any air). Completely close the ports during the down stroke of the brake pedal, with the tubing still attached. Be sure each bleed port is closed snuggly.
Most of the brake fluid can be reused, but not the darker portion at the bottom of the jar.

Oct 09, 2016 | 1997 Mercury Sable

1 Answer

Gday and happy new year hope you may have some advice that may help me with a problem im having i bought a disc brake conversion kit for my 64 bird we fitted up the kit with new lines the ki


First of all, I hope you got a new master cylinder with your disc brake kit. A new master cylinder should be bled before connecting the brake lines and then never allowed to pull in air during the rest of the bleeding process. A couple of fittings ans hoses should have come with the new master cylinder [see the kit listed for a picture]. If the master cylinder has an air bubble, you won't be able to properly bleed the rest of the system.
For the rest of the system you can make up a small catch bottle like the one pictured in the one man brake bleed kit; make sure the hose goes tot he bottom of the catch bottle. You have to cap the master cylinder reservoir before pumping the brakes or fluid will squirt out and all over; brake fluid is a like paint remover. Then start with the brake farthest from the master cylinder and bleed fluid out by having a buddy pump the brakes while you hold the catch bottle above the bleeder port so no air gets back in. [hint, put some pipe teflon tape on the outer threads only, not the inner end of the bleeder screws to seal the threads]. Check the master cylinder level often! If the brakes still are spongy after the first round of bleeding, have a buddy pump up the brake pedal with the bleeder screw closed and hold pressure on the pedal; you then open the bleed port until the pedal goes to the floor; have your buddy hold down the pedal until you close the port. Repeat on all brakes until the pedal is firm.

Jan 26, 2015 | Cars & Trucks

1 Answer

How to bleed clutch 2007 compass


GRAVITY BLEEDING CLUTCH HYDRAULIC CIRCUIT

1. Verify fluid level in brake master cylinder. Top off with DOT 3 brake fluid as necessary. Leave cap off.

2. Raise vehicle on hoist.

3. Remove bleed port protective cap and install suitable size and length of clear hose (4) to monitor and divert fluid into suitable container.

4. Open up the bleed circuit by turning the thumb screw (3) counter clockwise this will start the air purge and fluid fill process.

5. Lower vehicle, but only enough to gain access to and fill the brake master cylinder. NOTE: Do not allow clutch master cylinder to run dry while fluid exits bleed port.

6. Top off brake master cylinder fluid level while air is purged and fluid drains from bleed port. Continue this until no air bubbles are seen and a solid column of fluid exists.

7. Close hydraulic bleed circuit, remove drain hose and replace dust cap on bleed port.

8. From driver's seat, actuate clutch pedal 60-100 times.

9. Apply parking brake. Start engine and verify clutch operation and pedal feel. If pedal feels fine and clutch operates as designed, stop here. If pedal still feels spongy or clutch does not fully disengage, excessive air is still trapped within the system, most likely at the master cylinder.

10. Top off brake master cylinder fluid level with DOT 3 brake fluid as necessary.

POWER BLEEDING CLUTCH HYDRAULIC CIRCUIT

1. Remove reservoir cap and connect bleeder cap to reservoir. NOTE: Use Bleeder Cap/Modified reservoir cap adapter Snap-on #901-059 or equivalent.

2. Connect service filling machine to bleeder cap. NOTE: Use Service Filling Machine/Brake power bleeder Brake power bleeder or equivalent.

3. Service filling machine should be pressurized to at least 2.5 bar (36 PSI).

4. Remove dust cap from bleeder valve and connect the transparent bleeder hose to bleeder valve.

5. Place the other end of hose in the bleeder container to capture the used fluid. The end of the hose MUST be submerged in the DOT 3 brake fluid.

NOTE: Use Bleeder Container To capture hydraulic fluid and Transparent Bleeder Hose To route fluid to container.

6. Turn on the service filling machine.

7. Crack open the bleeder valve (3).

8. Allow fluid to flow out of bleed port until no more air bubbles can be seen in the transparent bleeder hose.

9. Once fluid is free of air bubbles; make 15 quick actuations between clutch pedal stop positions.

10. Close the bleeder valve and disconnect the service filling machine.

11. To remove remaining air, actuate pedal 10 times slowly between pedal stop positions.

12. Check clutch pedal to see if vehicle is properly bled.

13. If vehicle is not properly bled, repeat procedure.

14. Remove bleeder cap from reservoir and replace reservoir cap.

15. Disconnect transparent bleeder hose from bleeder valve and replace dust cap.

Oct 15, 2013 | 2007 Jeep Compass Limited

1 Answer

1990 jeep wrangler bleeding breaks


Hi there:
I suggest to check this procedure, when the hydraulic brake system must be bled whenever a fluid line has been disconnected because air gets into the system.

A leak in the system may sometimes be indicated by a spongy brake pedal. Air trapped in the system is compressible and does not permit the pressure applied to the brake pedal to be transmitted solidly through the brakes. The system must be absolutely free from air at all times. If the master cylinder has been overhauled or a new cylinder has been installed, bleed the cylinder on a bench before installation. When bleeding brakes, bleed at the wheel most distant from the master cylinder first, the next most distant second, and so on. During the bleeding operation the master cylinder must be kept at least 3 / 4 full of brake fluid.


The ABS bleeding procedure is different from the conventional method. It consists of the following three steps:
Step 1: Conventional manual brake bleed.
Step 2: Bleeding the system using the DRB scan tool.
Step 3: An additional conventional manual brake bleed.

The recommended ABS bleeding procedure is as follows:
  1. To bleed the brakes, first carefully clean all dirt from around the master cylinder filler cap. Remove the filler cap and fill the master cylinder with DOT 3 brake fluid to the lower edge of the filler neck.
  2. Bleed the master cylinder first. Have a helper operate the brake pedal while bleeding each master cylinder fluid outlet line. Do not allow the master cylinder to to run out of fluid,as this will allow additional air to be drawn into the cylinder.
  3. Bleed the brake system in the following sequence:
    1. Master cylinder
    2. HCU valve body (at fluid lines)
    3. Right rear wheel
    4. Left rear wheel
    5. Right front wheel
    6. Left front wheel
  4. Clean off the bleeder connections at all four wheel cylinders. Attach the bleeder hose to the right rear wheel cylinder bleeder screw and place the end of the tube in a glass jar, submerged in brake fluid.
  5. Open the bleeder valve 1/2 - 3/4 of a turn.
  6. Have an assistant depress the brake pedal slowly and allow it to return. Continue this pumping action to force any air out of the system. When bubbles cease to appear at the end of the bleeder hose, close the bleeder valve and remove the hose.
  7. Check the level of fluid in the master cylinder reservoir and replenish as necessary.
  8. After the bleeding operation at each wheel cylinder has been completed, fill the master cylinder reservoir and replace the filler plug.

Do not reuse the fluid which has been removed from the lines through the bleeding process because it contains air bubbles and dirt.


  1. Perform the "Bleed Brake'' procedure with the DRB II scan tool. This procedure is described in the DRB II software information and diagnostic guide.
    1. Attach the DRB II scan tool to the diagnostic connector.
    2. Run the Bleed Brake procedure as described in the DRB II tester guide.
  2. Repeat the conventional bleeding procedure as previously outlined.
  3. Fill the master cylinder reservoir to the proper level.
  4. Check the brake operation.


Hope this helps.

Apr 21, 2013 | Jeep Wrangler Cars & Trucks

2 Answers

Brake pedal spongy after replacing master cylinder and bleeding the syster


There is still air, presuming all brakes are in good shape and adjusted correctly. One issue is master cylinder PRE BLEEDING. If you do not pre bleed the cylinder, you may never get all of the air out. Parts stores sell a kit that has flexible hoses that connect to the brake line connections and submerge the other ends in the MC reservoir, bleed until no bubbles and from that point DO NOT let the fluid get low in the MC, or start over again.
Doc

Feb 08, 2012 | 1996 Chevrolet Suburban

1 Answer

How do i bleed the brakes on a 1999 Pontiac Grand Am?


Bleeding the Brake System
When any part of the hydraulic system has been disconnected for repair or
replacement, air may get into the lines and cause spongy pedal action (because
air can be compressed and brake fluid cannot). To correct this condition, it is
necessary to bleed the hydraulic system so to be sure all air is purged.

When bleeding the brake system, bleed one brake cylinder at a time, beginning
at the cylinder with the longest hydraulic line (farthest from the master
cylinder) first. ALWAYS Keep the master cylinder reservoir filled with brake
fluid during the bleeding operation. Never use brake fluid that has been drained
from the hydraulic system, no matter how clean it is.

The primary and secondary hydraulic brake systems are separate and are bled
independently. During the bleeding operation, do not allow the reservoir to run
dry. Keep the master cylinder reservoir filled with brake fluid.


  1. Clean all dirt from around the master cylinder fill cap, remove the cap and
    fill the master cylinder with brake fluid until the level is within 1/4 I n.
    (6mm) of the top edge of the reservoir.
  2. Clean the bleeder screws at all 4 wheels. The bleeder screws are located on
    the top of the brake calipers.
  3. Attach a length of rubber hose over the bleeder screw and place the other
    end of the hose in a glass jar, submerged in brake fluid.
  4. Starting at the right rear proceed in this order left front, left rear and
    right front.
  5. Open the bleeder screw 1/2 - 3/4 turn. Have an assistant slowly depress the
    brake pedal.
  6. Close the bleeder screw and tell your assistant to allow the brake pedal to
    return slowly. Continue this process to purge all air from the system.
  7. When bubbles cease to appear at the end of the bleeder hose, close the
    bleeder screw and remove the hose.
  8. Check the master cylinder fluid level and add fluid accordingly. Do this
    after bleeding each wheel.
  9. Fill the master cylinder reservoir to the proper level.


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Sep 21, 2010 | 1999 Pontiac Grand Am GT

1 Answer

How to change a master cylinder


a Master rates about a 5 out of 10 with 10 being the hardest

you may find the hardest part is the actual bench bleeding of the master
and/or
the replacement of the reservoir

These are the instructions from my service manual, but I do not remove the fluid prior to service steps 2-6

  1. Disconnect battery ground cable. Disconnect electrical connector from filler cap.
  2. Remove fluid reservoir filler cap.
  3. Raise and support vehicle.
  4. Remove front wheels.
  5. Remove dust cap and loosen bleed nipple. Connect a bleed tube to bleed nipple and into a suitable container.
  6. Pump brake pedal until all fluid is expelled. Tighten bleed nipple.
  7. Lower vehicle. Install brake fluid reservoir cap. Remove air cleaner and air cleaner outlet tube.
  8. Disconnect central electrical box electrical connector.
  9. Remove central electrical box retaining screw.
  10. Remove central electrical box and relocate to air cleaner area.
  11. Disconnect brake fluid feed tube. Disconnect brake lines.
  12. On models with anti-lock brakes, disconnect brake lines from Hydraulic Control Unit.
  13. On all models, remove brake booster vacuum hose.
  14. Extract master cylinder from vehicle.
  15. On models with manual transaxles, remove clutch hose from brake/clutch reservoir.
  16. On all models, remove master cylinder nuts and remove master cylinder.

To install, reverse removal procedure. Bleed brake system.

May 31, 2010 | 2001 Ford Focus

2 Answers

Brake are pungy on04gmc envoy


it would sound like your master cylinder if you did bleed your brakes right.

Aug 25, 2009 | 2004 GMC Envoy

2 Answers

Bleeding abs brakes


Try using a pressure bleeder. It will force the air out. Works every time.

Nov 08, 2008 | 2001 Ford Mustang

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