Brake Master Cylinder
Brake Master Cylinder
Replaced brake pads then proceded to bleed brakes, 3 times using these methods.
(NOTE: after installing the rear pads when I stepped on the brake to let the pistons come out, I heard like a spring give. Now I do not know if that thing I heard was a seal inside that made that gave.)
Also when bleeding the brakes, as soon as I open the nipple right before the pedal reaches the floor there is a noise emitted from the master cylinder, like an accordion sound.
1) Using Motive brake bleeder Right Rear / Left Front / Left Rear / Right Front
Got all bubbles out. Pedal travel was deep, slightly past throttle pedal.
2) Manually bled brakes In same order, 2 man method. I never let the fluid go
past 3/4 full on the resevoir. No bubbles, Still same result.
3) Manually Bled it doing the furthest from the master cylinder first. No bubbles Same result
Performed hydraulic test, where you pump the pedal 3 times them wait if the pedal drop with in 15-30 seconds...it did.
Performed Brake Booster Test, pump pedal again 3 times then start the engine if pedal sink, brake booster is working properly.
The weirdest thing and is driving me nuts is, if the master is faulty which ALL the test points it to be, why doesn't the brake fluid get depleted in the resevoir
(NOTE: after installing the rear pads when I stepped on the brake to let the pistons come out, I heard like a spring give. Now I do not know if that thing I heard was a seal inside that made that gave.)
Also when bleeding the brakes, as soon as I open the nipple right before the pedal reaches the floor there is a noise emitted from the master cylinder, like an accordion sound.
1) Using Motive brake bleeder Right Rear / Left Front / Left Rear / Right Front
Got all bubbles out. Pedal travel was deep, slightly past throttle pedal.
2) Manually bled brakes In same order, 2 man method. I never let the fluid go
past 3/4 full on the resevoir. No bubbles, Still same result.
3) Manually Bled it doing the furthest from the master cylinder first. No bubbles Same result
Performed hydraulic test, where you pump the pedal 3 times them wait if the pedal drop with in 15-30 seconds...it did.
Performed Brake Booster Test, pump pedal again 3 times then start the engine if pedal sink, brake booster is working properly.
The weirdest thing and is driving me nuts is, if the master is faulty which ALL the test points it to be, why doesn't the brake fluid get depleted in the resevoir
Last edited by Drift4; Mar 31, 2007 at 07:41 PM. Reason: spelling
I guess not much advance people here..............
I will post my findings after I replace the master cylinder...order part today, will be in Thurday, install on Friday
I will post my findings after I replace the master cylinder...order part today, will be in Thurday, install on Friday
Replaced Master Cylinder today, bleed all four corners, NO MORE spongy brakes.
The first seal for the Rear line failed, causing fluid to leak back into the resevoir.
FYI the master cylinder is made by BOSCH. I am sending the unit to Bosch since the company I work for is an authorized Bosch service Center, and see what else could have been cause of failure, and if they can warranty it, or rebuild.
The first seal for the Rear line failed, causing fluid to leak back into the resevoir.
FYI the master cylinder is made by BOSCH. I am sending the unit to Bosch since the company I work for is an authorized Bosch service Center, and see what else could have been cause of failure, and if they can warranty it, or rebuild.
