Question about 2000 Chevrolet Astro

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If the brake master cylinder leaks, will the abs light come on?

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Leaks air pressure yeah fluid depending on how much most masters have a small leak and there fine if its leaking alot your loosing pressuer which will cause the light to come on you dont want no leaks air or fluid in ur sys

Posted on Nov 20, 2009

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Posted on Jan 02, 2017

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co7196
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SOURCE: bad brakes on gmc suburban,

Gravity bleed your brakes starting at the wheel farthest from the master cylinder. No pweddle pumping. I Fill M/C and leave cover off. Then open the bleeder and watch what is coming out. Uou can see bubbles. When the fluid drips steady and without bubbles, cole and do the same to the other three. Don't let the master cykinder get low because thr fluid level helps move the fluid and air through the lines.Periodically tap the break lone with your wrench to keep everything moving.. When sll bleeders drip clean and steady. Make sore your rear brakes are adjusted to barely touch the drum. Then top off the master cylinder, cap it and give yourself a "break". :)

Posted on Jun 15, 2009

  • 330 Answers

SOURCE: Toyota Land cruiser ABS Failure

What kind brake fluid you use, the best way is to get dealer O ring and use dealer's brake fluid. some brake fluid damaged the rubber.

Posted on Jul 26, 2008

SOURCE: problem on abs sistem

you need a brake booster as far as abs light you need to to put tester on system and find out what code it has in it before i can diag you have to seprate prolbems

Posted on Oct 07, 2008

  • 691 Answers

SOURCE: 1994 Cavalier -replaced master cylinder-no pressure to rear brake

The most common bleeding procedure is to bleed the ABS brake furthest from the master cylinder first, then bleed the other brake that shares the same hydraulic circuit (which may be the other rear brake on a rear-wheel drive car, or the opposite front brake on a front-wheel drive car or minivan). After these have been bled, you then bleed the other brake circuit starting with the furthest brake from the master cylinder.
Air can be very difficult to remove from an ABS modulator assembly because of all the nooks and crannies inside the unit. The modulator may have eight to 10, or more, ABS/traction control solenoid valves, plus various check valves and dead-end ports. Some ABS modulators have special bleed screws to help you vent the trapped air when bleeding the system. Others do not and require the use of a scan tool to cycle the ABS solenoids while you bleed the system. 1. To bleed the isolation valves in the modulator, there are two bleeder screws. Start with the one toward the engine. Turn the ignition on and apply light pressure on the brake pedal. Open the bleeder screw and allow the fluid to flow until clear. Close the screw and do the same at the second bleeder screw. 2. Depressurize the accumulator by pumping the pedal 40 times with the key off. Wait about two minutes for the brake fluid to de-aerate, then refill the fluid reservoir with DOT 3 brake fluid. 3. Now you can bleed the boost section. This is done by applying moderate pressure on the brake pedal and turning the ignition on for three seconds, then off. Repeat this a total of 10 times. Make sure the pedal feels firm when you have finished, and give the car a road test to make sure the brakes are working properly.

Posted on Jul 25, 2009

  • 225 Answers

SOURCE: brake bleeding

if you didn't bleed the lines after putting the master in. then there is a good chance there is air in the lines now. may go through a quart of brake fluid before all the air is out. remember to start at r-rear/ l-rear/ r-front/ l-front last.will take some time. don't forget to adjust the rear brake while your there to help with the pedal

Posted on Aug 13, 2009

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1 Answer

I have abs,tc and hill desent light on at same time how do I resolve and are they linked the brake master cylinder is leaking


These are most likely all related to the leak. Replace you master cylinder, this needs to be done. From there if the lights do not go out you need to address those individually.

Feb 21, 2015 | 2001 Land Rover Discovery Series II

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ABS light on and brakes locking up after master cylinder and brake booster replaced,what is wrong?


have it pumped down again an look at the fluids for contamination , inspect for leaks

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1995 chevy Monte Carlo the brakes don't work keep lossing brake fluid some under the antilock brake computer abs there are no warning lights except when almost out odds fluid then brake light comes on


You will need to remove ABS valve body, a.k.a. brake computer to address leak, but before doing so I would take a closer look at brake master cylinder which is probably the guilty party. I've been working on cars for 26 years and have never seen an ABS valve body leak. That don't mean it can't be, but I wold be more likely to suspect the master cylinder is leaking, and the fluid is running down the outside of the brake line and dripping off at the ABS valve body. Hope I helped, good luck:)

Mar 10, 2014 | Cars & Trucks

1 Answer

1999 DODGE Dakota abs & brake light are on and brake pedal goes right to the floor but the vehicle does stop at slow speed


sounds as if there might be a brake fluid leak somewhere in the system.check the master cylinder to see if the brake fluid is low or almost empty,if the fluid is up then it could be a master cylinder that has an internal leak(meaning the fluid is leaking past the internal seals but not leaking out of the cylinder).it also can be a problem with the abs hydraulic control module leaking.you should have the abs system checked for any codes in that system which may help find the problem quicker,if you don`t find any problem with the other suggestions

Mar 08, 2011 | 1999 Dodge Dakota

1 Answer

I lost my brakes. no warning. no brake light. peddle goes to the floor.abs doesnt work.


if the master cylinder is full of brake fluid, then replace the master cylinder, if master cylinder is not full of fluid then fill with DOT 3 brake fluid pump brakes and look under truck for leak.......GOOD LUCK

Feb 24, 2011 | 2002 Dodge Durango

2 Answers

ABS and BRAKE light at the same time


push the pedal and see if it goes to the floor slowly or fast, if so,some thing like this i would lay on the ground in the back and have some one push the pedlal and hold it, look for fluid, like wet spot near the wheels first ( i have seen wheel cylinder go bad but not leak alot at one time so keep that in mind too) and make your way to the front on the driver side inside of the fram.i dont think its the master cylinder but see if you can see a wet spot at the bottom of the master and the booster( i seen masters not leak as will )

leaks will make the ABS lite come on

Apr 11, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Brake fluid transfer from Master pump to ABS pump


hi from uk if you are saying that the brake master cylinder reservoir fluid is falling in level? and that there is signes that fluid is leaking from the ABS hydraulic master cylinder ie fluid is leaking from the arpeture where the electrics wiring loom enters then there is probably one of the piston/valve seals leaking within abs assy ? or is leak from somewhere else? not had this problem before with fluid passing from abs assy resulting in reservoir losing fluid in this way?

Nov 11, 2008 | 1991 Honda Accord

1 Answer

1993 F350 ABS light


i had a problem with my abs light one night i had a brake line behind the driver front tire broke and it was leaking out all of the fluid and the abs light came on i replaced the line and filled up the master cylinder and it went away so check your lines and master cylinder

Aug 18, 2008 | 1993 Ford F350

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