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Replaced brake booster pads and rotors and master cylinder if I loosen the bolts from the master to the booster I can hear the air release and then the brakes are fine. how can I fix this problem

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1996 T-100 dash brake light will not go out

The brake fluid level sensor in the master cylinder is stuck in the lower position which completes the circuit to illuminate the light.. Try tapping lightly on the side of the reservoir to loosen it. If that does not help, you will need to replace the level sensor.
Thanks for choosing FixYa for assistance.

Posted on Jan 25, 2009

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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

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SOURCE: Fiat Uno Pacer - Brake Booster not assist braking

it could be that the master cylinder is bad or the brake booster is bad also check the vacum hose going to the brake booster if it has a hole in it it will lose pressure and make the engine lose rpms

Posted on Aug 23, 2009

  • 1 Answer

SOURCE: 98 TOYOTA CAMRY

I have had exacly the same issue, the mechanic replaced the brake pads, calipers, hoses/brake lines, then after all that and it still happening, he replaced the brake master cylinder and all was well, except for my wallet !!!!

Posted on Nov 14, 2009

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SOURCE: Spongy brakes

So long as the brake booster is working, test it by turning on the engine, press the brake pedal all the way down, then shut off engine keeping your foot on the brake pedal, if the pedal comes up slightly pushing against your foot then the booster IS working.

Did you BLEED the brakes??????

Posted on Mar 29, 2010

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2 Answers

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

1 Answer

Land cruiser 2005 troop carrier brake stopping power is poor


Probably there is a leak in the hydraulic brake line hoses connecting the master and the wheel cylinder hose. Also get the brakes bleeded to remove any air the system. also get the check valve of the brake booster checked and the vacuum hose.

Jun 27, 2013 | 2005 Toyota Land Cruiser

1 Answer

Cavalier master cylinder


You have air in your system, you need a helper to bleed the air out. The master cylinder is what ur brake fluid resivore is sitting on, the large round object behind it is the brake booster (looks like a squished basket ball) these will be on the fire wall driverside

Nov 05, 2012 | 1999 Chevrolet Cavalier

1 Answer

Replace disc pads procudure


They are actually pretty simple, but check or replace the rotors before you install new pads. The front discs have 2 bolts per caliper as do the rears. There are hardware clips that are different on the front and rear.

You unbolt the caliper and tie it up with a rope or coat hanger so the caliper does not hang by the brake hose. Service the rotors and then when you are ready to replace the caliper, you take off the master cylinder cover. Then you use a "C" clamp to drive the caliper piston flush into the caliper. Doing this will force Brake fluid back into the Master cylinder. This is why the Master cylinder cap must be off. Attach the brake pads with a chemical to eliminate rattles and then slide the loaded caliper over the rotor. Attach the 2 bolts on the caliper and then you are ready to bleed the system.

Repeat this on each wheel and then bleed all 4 wheels. There will be very little air in the system using this method. The back brakes have the E-Brakes inside the rotors. If you pull off the rear rotors you will have to loosen the E-brakes by turning the Starwheel inside the rotor to allow for more clearance. Adjust the same Starwheels by tightening until independent wheel drags substantially, then loosen up 5 or more clicks on the Starwheel.

The calipers will take care of themselves and center themselves through use. Thats about all I can say about this process. I hope this helps you.

Aug 28, 2010 | 2001 Mercury Grand Marquis

2 Answers

When i step on my brakes u hear a loud air noise and they are hard to stop


You need to replace the pads or u have a hose or line busted which immediatly needs to be replaced.Hope this helps and Thank You for asking.

Jul 19, 2010 | 1994 GMC Jimmy

1 Answer

Brake pad replacement 2004 audi a4 and rotor how do i do and what tools are neccessary?


YOU NEED REMOVE A LITTLE BRAKE FLUID FROM MASTER CYLINDER.THEN YOU RAISE VECHICLE SAFELY.SUPPORT IT WITH JACK STAND.MAKE SURE VECHICLE IS ON LEVEL SOLID GROUND.REMOVE TIRE OR WHEEL.THEN YOU NEED A LARGE C - CLAMP.PLACE C - CLAMP OVER BRAKE CALIPER AND BRAKE SHOE BACKING.TIGHTEN C - CLAMP JUST ENOUGH PUSH CALIPER PISTON BACK IN CYLINDER BORE TO REMOVE CALIPERS FROM ROTORS.TO REMOVE BRAKE CALIPER YOU NEED 2 OPEN AND BOX END WRENCHES ONE TO HOLD CALIPER SLIDE PINS AND THE OTHER WRENCH FOR LOOSEN CALIPER BOLTS.THEN YOU REMOVE CALIPER AND REPLACE FRONT BRAKE SHOES.IF YOU NEED TO REMOVE BRAKE ROTORS JUST REMOVE THE BRAKE CALIPER CARRIER SUPPORT BOLTS THE REMOVE THE BRAKE CALIPER CARRIER SUPPORT THEN REMOVE ROTOR.YOU NEED TO REPLACE BOLTS WITH NEWS AND USE LOCK TIGHT.THEN YOU PUT IN NEW BRAKE PADS IN CALIPER PUT CALIPER BACK ON SUPPORT CARRIER.REPLACE WITH NEW BOLTS USE LOCK TIGHT THEN TORQUE BOLTS TO 26 FT LBS.MAKE SURE MASTER CYLINDER COVER IN PLACE.WHEN YOU FINISH REPLACING BOTH FRONT BRAKE PADS PUMP BRAKE PEDAL TO SEAT BRAKE SHOES AGAINST BRAKE ROTORS SO YOU WILL HAVE FIRM BRAKES WHEN YOU APPLY THEM. THEN CHECK YOUR BRAKE FLUID LEVEL IN MASTER CYLINDER MAKE SURE ITS NOT LOW. MAKE SURE YOU HAVE FIRM BRAKES BEFORE DRIVING.IF YOU HAVE ANY PROBLEMS CHANGING FRONT BRAKE PADS YOU CAN GO TO ANY AUTO PARTS STORE AND BUY A HAYNES REPAIR MANUAL.

Jun 16, 2010 | 2004 Audi A4

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

2 Answers

Ford f250 diesel . front brakes come on when driving, don't have to use brakes. changed all calipers and hoses. if i bleed the calipers then they will start to release, sometime you can hear the brake...


sounds like a bad master cylinder, next time brakes are locking up , open bleeder screw and see if that releases brake at that wheel if it does then replace master cylinder, good luck.

Oct 13, 2009 | 2002 Ford F250 Super Duty SuperCab

1 Answer

Fiat Uno Pacer - Brake Booster not assist braking


it could be that the master cylinder is bad or the brake booster is bad also check the vacum hose going to the brake booster if it has a hole in it it will lose pressure and make the engine lose rpms

Aug 16, 2009 | 2006 Fiat 124

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