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#1
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brake problem
I just replaced my front brakes. All went well, until I started driving the car. The pedal hit the floor. I need to pump it a few times to make it grab. I've changed brakes before, the only difference is... I released the lid on the brake fluid master cylinder, just as I read on the forums. I thought I must have let air in the system, so I bled the lines with no change. I read in the manual that the front brakes don't engage until the rear ones do first. Because the rear pads are old and the front ones are new, would this cause the problem?
Last edited by dannmarr; 05-05-2005 at 07:32 PM. |
#2
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Barring some paranormal event, you need a new master cylinder. Eventually you won't be able to pump the pedal and stop at all.
No, the difference in pad age doesn't matter. No, the feature of the rear brakes being held off until the fronts apply is a safety feature to keep the rear end from skidding around the front. It's such a small difference in time that you would never have suspected it had you not read it. When you push the pistons back into the caliper you should first open the bleeder on that caliper and push the fluid out instead of back through the ABS pump and into the master cylinder. There's a lot of gargbage that accumulates in the calipers.
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ASE Certified Master Automotive Technician w/L1. ASE Certified Master Medium/Heavy Truck Technician. Certified EVT (Emergency Vehicle Technician) Last edited by Beav; 05-04-2005 at 10:10 PM. |
#3
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Did you bleed all four brakes?
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#4
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And there is an order to bleed them in too.
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#5
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I bled them all in the correct order, still no good. Can different pad sizes have this affect?
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#6
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The symptoms seem to point to the master cylinder but I'm sure you didn't touch that when changing the brakes.
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#7
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Quote:
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ASE Certified Master Automotive Technician w/L1. ASE Certified Master Medium/Heavy Truck Technician. Certified EVT (Emergency Vehicle Technician) |
#8
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I fixed the problem. I bought a "one man bleeding kit" for 4 dollars at an auto store. Comes with a plastic bottle and a see through tube. Just connect the end of the tube to the bleeding valve, pump the brakes, check the tube. If you see bubbles in it, pump the brakes again until they are all gone. Job done. I believe air entered into my brake line because I left the cap loose on the master cylinder while changing the brakes, something I never did in the past. Thanks for everyones input.
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#9
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Leaving the cap loose won't allow air into the system. Keep an eye on it for a couple days, don't get into a situation in case the problem recurs.
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ASE Certified Master Automotive Technician w/L1. ASE Certified Master Medium/Heavy Truck Technician. Certified EVT (Emergency Vehicle Technician) |
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