odd question about brakes!!!

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Jan 3, 2007 | 10:02 PM

furrby

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From: north carolina

odd question about brakes!!!

i have an 01 2wd with a 4.6l motor. i replaced the rotors and calipers a few weeks ago. i am unsure if i have air in the lines or if it is something else. here is what it is doing. braking about 25mph and below 20 mph the brakes work fine. around the 22mph mark i get a funny pedal pressure and i seems like i can feel the rotors and pads rubbing together. as the speed comes down, i get the feel right at 22mph and at 20mph it feels normal. sometimes i have the same feeling around 10mph, but very rare. i feel it around the 22mph just about everytime, unless i am using an extremely lite pedal. any information would be great.

furrby

Jan 3, 2007 | 10:46 PM

thehawk789

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what type of pads and rotors do you have?

Did you bleed the lines after replacing the calipers or no?

either one of these things could be a factor, or both.

did you clean the wheel hub at all? excessive crap and rust on the hub can cause the rotor to not sit flat, and it may feel like a warped rotor.

Jan 10, 2007 | 01:29 PM

furrby

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From: north carolina

sorry for the delay in responding. i got new rotors and pads off ebay. they are r1concepts. as for bleening the lines, i let almost all the fluid out of the lines and tank and replaced it with syn. fluid. i was thinking it was air in the lines, but i just didn't understand why it only happen at around 22mph. i did clear the hulb and removed almost all the grease. i regreased everything with syn. grease. i was wanting to see if there is anything i need to check out before i call the company i where got the rotors. i was hoping it wasn't a warped rotor. i will check the job again and rebleed the brakes and see if that helps. thanks for taking the time to respond. it has been helpfull.

furrby

Jan 10, 2007 | 05:22 PM

Joe Finn

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From: DC

By "syn fluid", do you mean DOT 5? I don't think it's compatible with DOT 3 fluid unless you completely flush the whole system. Maybe someone else can confirm that.

Jan 10, 2007 | 09:20 PM

thehawk789

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I wouldnt worry about the fluid, I would think more about air in the lines. You need to have someone open the bleeder valves after you have pumped up the brake pedal, then have them open it up and press down. They should only have to open it a little and air will bubble out, repeat as necessary until no more air bubbles out.

Is your truck 2wd or 4? The axel nut could be a tad bit too loose if its a 2wd.

Jan 24, 2007 | 12:45 PM

furrby

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From: north carolina

it is a two wheel drive. i will check the nut when i rebleed the lines. thanks.
furrby

Jan 24, 2007 | 02:04 PM

barnettdh

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Quote:

Originally Posted by thehawk789

I wouldnt worry about the fluid...

Actually, I think he should worry about the fluid. If he used DOT 5 and not DOT 5.1, he has introduced an incompatible fluid into his system: http://www.advancepetro.com/differentbrakefluid.htm