Question about 1997 Chevrolet Blazer

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Put on new masetr cylinder on and still no fluid to back brakes is it the booster or something else

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It is either the combination valve or the proportioning valve the way to check is to loosen the line after the valve and see if fluid comes out if not that is your problem

Posted on Sep 23, 2009

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2005 gmc envoy front pads won't release put on 2 new calipers,2 new brake hoses, new rotors & pads. can you help?


Check ur master cilinder , a way to know if your wheels are free, jack it up turn the wheel by hand if not realese the bleeder on top of the caliper and try again if it is free probably u need to replace master cil.

Dec 02, 2014 | 2005 GMC Envoy

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It just loses pressure all the time and can be quickly pumped back up. and there is gunk in the fluid - would just cleaning the booster and master cylinder, and putting it back with new brake fluid fix...


are you meaning you have a hard brake ? it is hard to brake? if so ,it is because your brake is lack of vacuum pressure. then you need to change a new vacuum brake booster , you can visit us for more information at : http://ca1020012840.fm.alibaba.com/

Oct 10, 2013 | 2008 Mercury Mariner

1 Answer

20000 GMC Jimmy brake light came on, someone told us it's the booster. Is this the same as the master cylinder or something different. Also where is it located?


don`t just change parts because someone told you to without checking it out first.with the brake light on check the fluid level in the master cylinder if its down check the float in the cylinder as these will get stuck.also check for fluid leaks in the entire brake system and condition of the brakes themselves as when they wear especially the disc brakes the fluid will go down as the brake fluid takes up the worn brake material so the calipers don`t have to move as far to apply the brakes.the master cylinder is the component that holds the brake fluid under the hood that you would top up if low.the brakes booster is what the master is bolted to and gives the car power brakes as opposed to manual brakes.

Nov 02, 2011 | 2000 GMC Jimmy

1 Answer

2003 Corolla brake fluid leak. Brake pads are new and there is no evidence of leak on ground. However, the brake fluid light comes on occasionally indicating low fluid. Sure enough, the fluid is low. Any...


If there is no visible leaking at the wheels around the braking assembly's, then the fluid will be leaking out he back of the blake master cylinder into the vacuum booster. The master cylinder is where you have been topping up the brake fluid and the booster is the big black thing the master cylinder is bolted to. You need to have this looked at by a mechanic for proper repair (unless you really trust someone),as brakes are something I think are important to a vehicles operation.

Just as a note, there is no need to buy a new master cylinder, as most brake places would have exchange units available.

Jul 10, 2011 | Toyota Corolla Cars & Trucks

2 Answers

Spongy brake pedal apears to be leaking fluid from brake booster


check or adjust brake pedal, check brake booster or replace new one, check pedal return spring and bushing, check all wheel cylinder or replace, check brake shoe or brake pad, check brake fluid or replace,.

Apr 03, 2011 | 1999 Pontiac Sunfire

2 Answers

When I start the truck, brake pedal goes down on it's own and will not come back up unless you pull it up , Booster?


The booster is working properly if the pedal goes down a little when starting the truck. Seems more like it's a master cylinder problem if it won't pump up.

REMOVAL & INSTALLATION Fig. 1: Disconnect the warning indicator at the master cylinder 88289p00.jpg
Fig. 2: Remove the fluid to minimize the amount that would otherwise inevitably be spilled 88289p01.jpg
Fig. 3: Unscrew the line fittings at the master cylinder 88289p02.jpg
Fig. 4: Hold a rag under the fittings to keep fluid from dripping all over things 88289p03.jpg
Fig. 5: Unbolt the master cylinder from the brake booster 88289p04.jpg
Fig. 6: Remove the master cylinder from the vehicle and set it in a clean location 88289p05.jpg
  1. Disconnect the negative battery cable.
  2. Apply the brake pedal several times to exhaust all the vacuum in the system.
  3. Detach and cap the brake lines from the master cylinder.
  4. If equipped, detach the brake warning indicator connector. NOTE: A turkey baster (tapered tube with a squeeze ball on top) works well for removing fluid from the reservoir (see photo).
  5. Siphon off the fluid from the master cylinder reservoir to minimize spillage when lines are disconnected.
  6. If applicable, disconnect and cap the Hydraulic Control Unit (HCU) supply hose at the master cylinder reservoir and secure in a position to prevent loss of fluid.
  7. Unfasten the 2 nuts and lockwashers that attach the master cylinder to the brake booster.
  8. Remove the master cylinder from the booster by sliding it forward and upward from the vehicle. To install:
  9. Install a new seal in the groove in the master cylinder mounting face.
  10. Position the master cylinder assembly over the booster pushrod and onto the 2 studs on the booster assembly.
  11. Install the retaining nuts, then tighten to 18–25 ft. lbs. (24–34 Nm).
  12. Uncap and connect the brake lines to the master cylinder. Tighten the front fitting to 16–21 ft. lbs. (21–29 Nm), and the rear fitting to 10–15 ft. lbs. (15–20 Nm).
  13. Uncap and connect the HCU hose to the master cylinder reservoir fitting and secure with a hose clamp.
  14. If equipped, connect the brake warning indicator.
  15. Fill the master cylinder with Heavy Duty Brake Fluid C6AZ-19542-AA or equivalent DOT 3 brake fluid from a clean, sealed container. Bleed the entire brake system, as outlined in this section.
  16. Connect the negative battery cable.
  17. Operate the brake several times, then check for external hydraulic leaks.
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Aug 03, 2010 | 1992 Ford F350

1 Answer

Replace my master cylinder and booster


ok to replace it is preety straight foward..the master cylinder is built onto the booter (its where u put the brake fluid)


  • locate master cylinder and booster..
  • remove hoses and connections (remember where everything came from) take pics if you have to
  • unbolt and remove both cylinder and booster
  • bolt up new booster and cylinder
  • connect hoses and other connections..
  • fill with fluid.
now you have to bleed your brake lines

locate brake line on front wheel (its in the back,, cant miss it)
slacken one of the valves or remove the hose..
plug line with finger
pump brake a few times until it gets hatd and hold it down ,, release line brake will get soft
repeat a few times ,connect back line.


thats it your done..

dont forget to rate me if you find this helpful

Mar 20, 2010 | 1997 Chevrolet Blazer

1 Answer

Install new brake pads and rotors all 4 wheels. Replaced front 2 calipers. Bled brakes. New clean fluid coming out. pedal is still soft and goes to floor. 200 Seebring.


Are you losing any Brake Fluid? Is it visible anywhere at the four wheels? Is it visible anywhere else?
The Master Cylinder may be defective. When you bled the Brakes did you maintain proper Brake Fluid Level in the Master Cylinder? If you didn't: and air entered into the Master Cylinder there maybe air within in the system in the Master Cylinder. You can bleed the Master Cylinder by removing the brake lines, adding more fluid, pumping the brakes, bleeding the air out of the system.
Are you losing Brake Fluid and can't find a noticeable leak? Then there is a good posibility that the rear seal in the Master Cylinder is leaking and the Fluid is going into the Brake Booster - which is the large wheel shaped drum located on the fire wall. In this case both the Brake Booster and the Master Cylinder will have to be removed and replaced. The Booster contains seals that Brake Fluid is very caustic to and will ruin these seals- causing future failures.
If no Brake Fluid is lost, no leak found: Check the Brake Booster Vacuum Advance. This should be connected to the outside of the Booster, attached to a hose, with the hose going to the engine. Check to see if this is working properly. Replace if needed.

Dec 31, 2009 | 2002 Chrysler Sebring

1 Answer

Experienceing loss of power to brakes


1. What is the Brake Fluid Level?
2. Are you losing any Brake fluid at all? Are there any puddles or noticeable wetness on the ground or on the tires/wheels? With vehicle parked, the reservoir filled (overfilled), and engine running: pump the brakes and check on the ground and back sides (inside portions) of the wheels. Look for any brake fluid leaks.
3. Leaks from Calipers usually means a leak from the caliper piston. The rubber seals will be wet.
Leaks from Drums usually means a leak from the wheel cylinder.
4. In any case of leaks from the wheels - replace the calliper OR wheel cylinder.
For caliper leaks: change the brake pads, and clean the rotors with brake cleaner.
For drum leaks: clean the drum and brake hardware with brake cleaner, and replace the shoes.
5. If no leak is detected from the wheel area's: check under the Master Cylinder for wetness indicating a possible leak.
6. If no leak can be found: you MAY have a rear seal leak in the Master Cylinder which is pumping Brake Fluid into the Brake Booster (that large disk looking thing attached to the fire wall, attached to the Master Cylinder in front).
a. Use a large drip/catch pan under the Van in the area on the Master Cylinder.
b. Disconnect the brake lines from the Master Cylinder using a flair wrench.
c. Remove the two nuts (12 or 13mm?) attaching the Master Cylinder to the Brake Booster. If you have been using a lot of fluid, and have found no leaks, here is a good possibilty that all that brake fluid has collected in the Booster; so when you detach the Master Cylinder from the Brake Booster, all that fluid will come rushing out!
7. If there is Brake Fluid inside the Brake Booster: there is no cleaning that out. Brake Fluid is very caustic to the seals inside the Booster and should be replaced.
8. Of course the Master Cylinder will also have to be replaced.
9. After replacing the Master Cylinder/Brake Booster - make sure you get all that spilled brake fluid off the engine compartment area parts! I use a brake cleaner, then mild soap and then water to rinse. Clean any Brake Fluid off Paint imediatley as it will quickly dissolves finishes and paint.
10. If no leak is detected and the Booster is clear, there may be problems with the Booster One-Way Valve. This is attached to the outside of the Booster and has a hose from an "advance" connected to it. This maybe malfunctioning where you are losing power. Replace this first before deciding to replace the whole booster (in cases of NON-LEAKS ONLY). If that did not work, there may be inner seals inside the Booster that have failed. That means a new Booster.
11. In any of the above cases: Make sure you bleed the Master Cylinder correctly and bleed the brakes (at each affected wheel) correctly. Any air in the brake lines will decrease your braking proficiency or could result in brake failure.

Let me know if this helped or if you have any additional information or questions. Feel free to contact me at FixYa.com!

Dec 10, 2009 | 1999 Dodge Caravan

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