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My 87 mr2 has spongey brakes so I replaced the mastercylider but when I went to bleed the the rear there was no pressure and they wouldn't bleed (they did bleed the last time) help please!

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  • 62 Answers

Did you bench bleed the master cylinder? if not, please bleed the master cylinder by cracking the brake lines at the reservior. see if you have fluid at the lines then.

Posted on Nov 04, 2012

  • abbie Nov 04, 2012

    Yeah I did and we are now getting fluid out of the rear now but the brakes are spongy unless you push hard/fast on them.

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Posted on Jan 02, 2017

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motor1258
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SOURCE: back brake lines wont bleed on 77 chevy truck

Check out this link & read about combination valve & how to center it when bleeding.

http://www.autozone.com/addVehicleId,1321403/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c1528007a632

Posted on Jan 23, 2009

  • 8 Answers

SOURCE: How can you bleed the left rear brakes on a 2003 Jaguar X-type?

keep pumping the brakes .it will bled .

Posted on Feb 24, 2009

  • 232 Answers

SOURCE: Spongy brakes after bleeding them 2 times. Should I try to bleed the master cylinder or replace it?

Honestly your guess is as good as mine. But I don't think the master cylinder is NOT bad you still have air in the system. Get a big bottle of brake fluid bleed all four sides until you run out of fluid or your brakes work properly. You should divide the bottle's content in four, then use each quantity in each side. You'll be removing air and contaminated fluid from the system. Get a small hose that fits on the bleeders and an appropriate container. I have a good feeling if you do this your brakes will work just fine. I don't know how you are bleeding the brakes. I'll let you know the proper way just in case. This is a two man job, with the wheel off, have someone start the car. Have them pump the brakes a few times to get pressure. 1With the brake pedal UP open the bleeder, 2then have your assistant press the brake pedal all the way down and leave it completely pressed down. 3Close the bleeder valve, once close and only with the valve closed have'm release the brake. Repeat as necessary, bake depressed, open valve first then press brake. DO NOT depress until valve completly closed. Close valve THEN depress. Good Luck!

Posted on May 15, 2009

  • 4340 Answers

SOURCE: bleeding brakes 2000 suburban wsith ab

Why were the brake lines replaced?

Sounds like the mastercylinder may have run dry. You have to bench bleed the master and then DO NOT allow fluid to run low, while bleeding brakes...

if master cylinder runs low on fluid and air gets in, almost impossible to bleed with out releasing the lines and bleed master it self.

Posted on Sep 20, 2009

  • 3600 Answers

SOURCE: rear brakes locking(until abs kicks in) with

Even if the proportioning valve is wide open the rear brakes should not lock up, this is indicative of the front piston not working on the master cylinder, if there was a problem with the abs it would throw a code so to check use two people to do this one to apply the brakes and one to tun the wheel. apply the brake gently while turning it by hand with all 4 wheels off the ground, if the wheels stop at the same time for all for wheels then you have another problem, Do this with the key on engine off in neutral. It sounds like you have a problem with the primary brake shoe the front of drum brake in rear or if disk then the disk brake. Check to see if the Emergency brake cables are not binding if the e-brake is disc the wire cable where the wheel splitter is may be frayed and is keeping the emergency brakes applied and causing this to happen. If this is not explained in a way you can understand post a reply and tell me to clarify if you don't understand what I am saying. The reason I say to do it without running is it will not use the ABS system to mess with your results this will test the mechanical area, thats where i think the problem is. If you let to much fluid drain out it is possible when you started bleeding the brakes if you did not bleed the fronts first you may have damaged the master cylinder piston seal for the disk brakes.

Posted on Dec 01, 2009

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1 Answer

Bleeding the brakes


Some vehicles have an odd way of bleeding them. My Chysler is one of them. Typically, you start from the wheel furthest from the master cylinder and complete one axle at a time, ending with the front wheel closest the master cylinder. On vehicles where the brake line is a tandem design, this is not the procedure. The brakes are bled diagonally beginning with the rear wheel closest the master cylinder and going diagonally to the front wheel, and then to the other rear wheel and then diagonally to the final front wheel, closest the master cylinder. Failure to follow the correct bleed protocol may leave some air in the lines, leading to a spongey pedal., depending on what type of brake line routing your vehicle has. Check your brake lines for leaks.

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This sounds like a bad brake line, these trucks are famous for rotted lines behind gas tank, make sure there are no leaks, this sounds like a leak or a defective master cylinder, if this is the same problem then i would say it is a line also check the rear brakes for leaking wheel cylinders unless you have rear disc brakes, check calipers for leaks.

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robert

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Spongy brakes after bleeding them 2 times. Should I try to bleed the master cylinder or replace it?


Honestly your guess is as good as mine. But I don't think the master cylinder is NOT bad you still have air in the system. Get a big bottle of brake fluid bleed all four sides until you run out of fluid or your brakes work properly. You should divide the bottle's content in four, then use each quantity in each side. You'll be removing air and contaminated fluid from the system. Get a small hose that fits on the bleeders and an appropriate container. I have a good feeling if you do this your brakes will work just fine. I don't know how you are bleeding the brakes. I'll let you know the proper way just in case. This is a two man job, with the wheel off, have someone start the car. Have them pump the brakes a few times to get pressure. 1With the brake pedal UP open the bleeder, 2then have your assistant press the brake pedal all the way down and leave it completely pressed down. 3Close the bleeder valve, once close and only with the valve closed have'm release the brake. Repeat as necessary, bake depressed, open valve first then press brake. DO NOT depress until valve completly closed. Close valve THEN depress. Good Luck!

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Hi there.

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start dismantle the calipers *follow the bolts holding the caliper to the suspension leg*

after you have re-fitted the calipers and brake bads re connect the brake lines and bleed the system to make sure and be safe. thanks alot Lee.

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