brake grinding...Why Wont My Brakes Work :(???


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brake grinding...Why Wont My Brakes Work :(???

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Auto Repair Home>> Automotive Repair>> Engine and Car Noises

drum18761
New User

Apr 22, 2012, 4:27 PM

Post #1 of 3 (2696 views)

brake grinding...Why Wont My Brakes Work :(???	Sign In

My brakes on my 2002 VW Passat recently started grinding and providing very little stop resistance when I applied the brakes.

I changed the front pads and front rotors, and to my surprise the rotors and pads were not in bad condition. When we went to bleed the brakes [“applied brake when bleed valve was open and retract brake when valve was closed”] the pressure in the break system was lost after approx. 6 cycles of bleeding even though the fluid reservoir was full and cap was off.

We determined the issue was the master cylinder. We replaced the master cylinder BUT WE FORGOT TO BENCH BLEED FORCING UNWANTED AIR INTO THE LINES. After bleeding the front drivers side caliper the brakes were once again pressurized. We continued to bleed the brakes at all 4 calipers on the car until no air bubbles were released from the lines.

When we went to test the car the brake pedal had an unreasonable amount of resistance, and applied an extremely SMALL amount of breaking force. Couldn't drive 15 mph and stop at a stop sign.

NOTE: when replacing pads on front passenger side the piston in the caliper could not be fully retracted, even when we used a massive C-clamp [“piston retracted but pushed back out after removal of C-clamp”], causing the pads to scrape the rotors. scraping was happening before the pad change but is much worse with thicker pads.

DOES ANYONE KNOW WHY THE BRAKES DON’T WORK???????

AND DO I DEFINETELY NEED A NEW CALIPER ON THE FRONT PASSENGER SIDE?????

Thank you very much in advance!

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 22, 2012, 5:16 PM

Post #2 of 3 (2664 views)

Re: brake grinding...Why Wont My Brakes Work :(???	Sign In

You need to stop duplicating question.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

nickwarner
Veteran / Moderator
nickwarner profile image

Apr 22, 2012, 5:24 PM

Post #3 of 3 (2652 views)

Re: brake grinding...Why Wont My Brakes Work :(???	Sign In

If a c-clamp won't push in you caliper piston, you obviously need a new SET of them. You replace brake parts in pairs or you will have uneven brakes. Your caliper is likely seized or the rubber hose going to it is internally collapsed.

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