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Brakes system is not building pressure even after replacing the master cylinder.no leakages please help.

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  • Nissan Master
  • 4,369 Answers

You have air trapeed in the system. either do a gravity bleed at each cylinder or buy a cheap pressure bleeder at Harbor Freight. Usually air is trapped in the disc brake calipers.

Posted on Nov 20, 2009

6 Suggested Answers

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Posted on Jan 02, 2017

Richie_asg1
  • 1036 Answers

SOURCE: 94 jeep grand cherokee laredo brake problem

Hi there!

Check for leaks at the slave cylinders and flexi hoses.

After several attempts of losing pressure - check the brake fluid level in the master.

If you arn't losing any fluid, You've got a damaged seal in the Master cylinder, or are drawing air in due to improper adjustment (excess travel) of slave cylinders.

Are you trying this with engine running? - How does this affect it (using servo assist)

Posted on Jun 15, 2008

  • 958 Answers

SOURCE: '92 Jimmy rear brake failure

have you checked the vacuum source of the master cylinder?. if it has a leak then it wont work properly. check the hose from cracks and chippings. check where it is connected and check if you have a good source of vacuum from your engine

is the pedal hard to step unto?

you have replaced everything and that is the only part that you have not look unto yet.

i hope i was able to fix ur problem..

tnx
drcool

Posted on Aug 15, 2008

  • 1118 Answers

SOURCE: brake system not holding pressure

did you bench bleed master cyl. before you installed it? its either you did not get all the air out, or you got a defective master cyl. if you did everything right and it will not hold pressure, than i would say its defective. believe me you do get bad ones, expecialy if they are remans.

Posted on Jan 14, 2009

  • 1 Answer

SOURCE: brakes

Flexible brake lines are probably balooning out causing pressure not to build up, replace flexible to the calipers.

Posted on Mar 03, 2009

  • 566 Answers

SOURCE: 2001 kia sportage soft brake pedel still doing

hi from the uk have had this problem on a customers car b4 who had replaced frot calipers and pads and pedal went to floor on inspection of caliper i found that the steel spring clip that fits into two holes in the front face of caliper and must also locate behind the caliper carrierbehind two lugs was fitted incorrectly it had been fitted behind the outer pad resulting in when brake pedal off ?the caliper being floating type as it is known because it is fixed by two screw pins/bolts and moves on these pins/bolts as pads wear ? what happens is the spring fitted wrongly ? actually pushes against the outer pad and as a result the caliper piston is pushed back into its cylinder slightly as it moves on the locating pins/bolts resulting in pedal going to floor on 1st application but if pumped ? some brake pedal force is felt but is lost again when pedal released ? so try this ? remove the steel clips from both front calipers that retain caliper to carriers then press brake/pump pedal ? if as suggested above works? your pedal should pump up and remain ok when you release and still be firm when re applied ? all above is what i found on ford ford but many other models use similar calipers and spring locating recheck how this spring should locate hope this helps ? good luck

Posted on Mar 19, 2010

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2007 chevy trailblazer code co131 brakes capliars locking up


DTC C0131 Antilock Brake System (ABS)/Traction Control System (TCS) Pressure Circuit

The master cylinder pressure sensor is located within the brake pressure modulator valve (BPMV). The master cylinder pressure sensor signal, to the electronic brake control module (EBCM), increases as hydraulic pressure in the front brake circuit increases.

Conditions for Setting the DTC co131
Any of the following conditions may cause the DTC to set.
• The EBCM detects open master cylinder pressure sensor circuitry.
• The EBCM detects shorted master cylinder pressure sensor circuitry.
• The master cylinder pressure sensor self-test, which occurs at power-up, fails.
• The zero-pressure signal voltage is not within an acceptable range.
• The master cylinder pressure is not within an expected tolerance based on deceleration rate and other data available to the EBCM.

1
Did you perform the Diagnostic System Check - Vehicle?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Vehicle
2
Inspect the vehicle for the following and ensure that there is no base brake failure:
• Dragging brakes
• Faulty parking brake switch
• Brake fluid leakage
• Air in hydraulic system
• Seized brake calipers
• Swollen, kinked or otherwise damaged brake hoses
Did you find and correct the condition?
YES - Go to Step 9
NO - Go to Step 3
3
Drive the vehicle in order to verify that the brakes do not self-apply during turning maneuvers.
Do the brakes self-apply during turning maneuvers?
YES - Go to Symptoms - Hydraulic Brakes
NO - Go to Step 4
4
Use the scan tool to clear the DTCs.
Turn OFF the ignition for 5 seconds.
Turn ON the ignition.
Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?
YES - Go to Step 5
NO - Go to Diagnostic Aids
5
Select the vehicle stability enhancement system (VSES) Data Display function on the scan tool.
Observe the Brake Switch Status parameter while pressing and releasing the brake pedal.
Does the Brake Switch Status change while pressing and releasing the brake?
YES - Go to Step 6
NO - Go to DTC C0161
6
Remove the electronic brake control module (EBCM) from the vehicle. Refer to Control Module References .
Inspect the master cylinder pressure sensor connector within the EBCM for damage or corrosion.
Is there connector damage or corrosion present?
YES - Go to Step 8
NO - Go to Step 7
7
Important: Following EBCM replacement, perform the set-up procedure for the EBCM. Use the scan tool to perform the Tire Size Calibration procedure.
Replace the EBCM. Refer to Control Module References .
YES - Did you complete the replacement?
NO - Go to Step 9
--
8
Important: Following EBCM replacement, perform the set-up procedure for the EBCM. Use the scan tool to perform the Tire Size Calibration procedure.
Replace the EBCM and the brake pressure modulator valve (BPMV). Refer to Control Module References .
YES - Did you complete the replacements?
NO - Go to Step 9
--
9
Use the scan tool Clear All Class 2 DTCs function to clear all of the DTCs from all modules.
Turn OFF the ignition for 5 seconds.
Turn ON the ignition.
Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?
YES - Go to Step 2
NO - System OK

Mar 13, 2017 | Cars & Trucks

1 Answer

No brake pressure


Sounds like a bad or empty Master cylinder or slave brake system leakage . Check the master for full brake fluid. Look for leaks at each wheel.
Maybe the system has to be bled.
Hope this helps.

Apr 02, 2014 | 2004 Pontiac Grand Am GT

1 Answer

Brake pedal wont build any pressure on my 1985 silverado even after i replaced the master cylinder


if you hear a loudish hissing noise when you hit the brakes you may need a new power booster as well my old 85 chevy did the same was booster not master cylinder hope this helps

Jan 30, 2013 | 1985 Chevrolet Chevy

2 Answers

Abs light is and so is brake light


Hi Kathy, I'm guessing that you mean you've replaced the brake master cylinder. It helps to be as specific as possible, so we can help you in a specific way. Make sure that the brake fluid pipes connecting the master cylinder are sealing correctly. There must be no leakage from them at all. Fill the reservoir and keep it filled throughout the whole bleeding procedure by having someone topping up each time the level goes down. Begin the bleeding procedure at the wheel furthest from the master cylinder and move one wheel at a time closer. The procedure is to push the pedal repeatedly to the floor and releasing to come full travel to the top of its movement. Repeat several times and while holding the pedal fully depressed to the floor open and close the bleeding valve on the wheel being bled before beginning the pumping action over. Once all wheels have been bled and you have reached the wheel closest to the master cylinder, if the pressure in the system is insufficient repeat the whole job until brake pedal pressure is normal. Look for signs of leakage on all four wheels in the event there is a leak on a wheel cylinder. The brake warning light should extinguish when the park brake is released and the ABS light when pressure is normal in the system, unless there is another separate fault. Finish up on the bleeding first and let me know how you get on. We'll tackle one job at a time. Regards John

Oct 14, 2012 | 1998 Chevrolet Blazer

1 Answer

Started off with cluth sticking to floor.would have to pull clutch pedal back up with foot. truck would stick in gear. even with clutch fully depressed. seemed like spring had disconnected from clutch...


your clutch uses a hydraulic master and slave cylinder to disengage. It is likely that the slave has been leaking and the reservoir gone dry, thus allowing air into the system and reducing effectiveness. Check the clutch master cylinder reservoir (near the brake reservoir) fluid level. If low, also check the slave cylinder at the clutch for leakage. If leaking, replace the slave and bleed the system. If you need procedures or have more questions, please let us know.

Sep 25, 2010 | 1994 Nissan Pickup

1 Answer

Brake pedal goes all the to the floor. can not


Check the reservoir to be sure the fluid is full. If not, top it off and try it again. If there's still trouble building pressure, pump the brakes a bunch of times, and then check around each wheel for fluid on the ground. If you see none, it's possible that you have a break in the line somewhere through the chassis and that the fluid is leaking out inside. If you see no evidence of leakage, and the reservoir is still full, you need a new brake master cylinder - what will have happened is that the diaphragm around the plunger inside the master cylinder (which moves through the cylinder when you push the pedal, and forces fluid out to the wheels) has a hole or tear in it, so instead of pushing the fluid out to the brakes, the plunger simply moves through the fluid. It never builds pressure, and your brakes don't work.

Dec 22, 2009 | 1992 Cadillac DeVille

1 Answer

Brake line diagram


Brake Lines and Hoses
Double-walled steel line is used in the hydraulic lines between the brake master cylinder and the front tube connector, and between the brake master cylinder and the flexible brake hose at the rear wheels.
Double-flared brake lines provide good leak-proof connections.
When replacing hydraulic brake lines, hoses, or connectors, tighten all connections securely. After replacement, bleed the brake system; refer to Section 206-00 .
The wet appearance of the outer cover of the rubber brake hose is referred to as "sweating." This is a normal condition for neoprene rayon braid hose and is not a sign of leakage or cause for replacement of the hose.

Hydraulic Brake System Components — Non-ABS

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Item Part Number Description 1 2005 Power Brake Booster 2 2455 Brake Pedal 3 2261 Rear Wheel Cylinder 4 2552 Rear Disc Brake Caliper— (Mexico Only) 5 2B120 Disc Brake Caliper—, Front 6 2B091 Brake Pressure Control Valves 7 2140 Brake Master Cylinder

May 02, 2009 | 1998 Mercury Tracer

1 Answer

Brakes


Flexible brake lines are probably balooning out causing pressure not to build up, replace flexible to the calipers.

Jul 26, 2008 | 1989 Chevrolet Silverado 2500

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