colsoop Posted August 1, 2008 Share Posted August 1, 2008 (edited) Right i can't seem to sort this out. My car has uk brakes (converted from j specs) I purchased a low miles Brake master cylinder and fitted it to my car. Filled it with fluid and proceeded to bleed the brakes via a air fed trigger operated bleeder kit. After doing all 4 corners rear left / right - front left / right the pedal is still going all the way to the floor, (when foot pressure is applied) I then bled the brake master cylinder to be sure it wasn't air trapped in there and again still to the floor, no resistance at all ! When i depress the brake pedal i get a humm noise as it goes through its range of travel to the floor. Any suggestions or help appreciated. Is the Master cuylinder fubared ? The other problem is i took my old one apart to check out what it was like so i can't swap them back over again to check Edited August 1, 2008 by colsoop (see edit history) Quote Link to comment Share on other sites More sharing options...
bignum Posted August 1, 2008 Share Posted August 1, 2008 It could very well be a dodgy master cylinder, but before you strip it down have you tried bleeding with the engine running as it could be air in the abs system? Quote Link to comment Share on other sites More sharing options...
colsoop Posted August 2, 2008 Author Share Posted August 2, 2008 Thanks for the reply, i will try that next. I must admit i didn't bleed with the engine runnning, i have never needed to before. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 2, 2008 Share Posted August 2, 2008 If youve got ABS then brake bleeding is a mare, once you get air into the pump its a beeatch to get out, and it only takes a small amout of air to cause probs. Can I ask why you changed your master cylinder? Quote Link to comment Share on other sites More sharing options...
colsoop Posted August 2, 2008 Author Share Posted August 2, 2008 If youve got ABS then brake bleeding is a mare, once you get air into the pump its a beeatch to get out, and it only takes a small amout of air to cause probs. Can I ask why you changed your master cylinder? I changed it because i saw a low mileage one come up for sale and having bled the brakes i still got a spongy pedal. I thought the MBC maybe a little tired (98k miles on mine) so a swap to a low mileage unit was the plan. I have a couple more diagnostic tests to try to see if i can locate where the issue is as bleeding with engine running still hasn't helped. Quote Link to comment Share on other sites More sharing options...
bignum Posted August 2, 2008 Share Posted August 2, 2008 There is a bleed nipple on the abs iirc, might be worth a go. Quote Link to comment Share on other sites More sharing options...
colsoop Posted August 8, 2008 Author Share Posted August 8, 2008 I sorted it out . It appears the air supply i have is not man enough for the brake bleeding kit Doing it the old school 2 man way has left a nice firm pedal again. Quote Link to comment Share on other sites More sharing options...
uk-rich Posted August 8, 2008 Share Posted August 8, 2008 did you have to touch the abs side of things col Quote Link to comment Share on other sites More sharing options...
colsoop Posted August 8, 2008 Author Share Posted August 8, 2008 did you have to touch the abs side of things col No i didn't need to. I Bled the master cylinder though. Quote Link to comment Share on other sites More sharing options...
gordy07 Posted August 8, 2008 Share Posted August 8, 2008 I dont know if you you seen my post colsoop about fookin the seal between the resevior alloy bit and the master cylinder but i think ive burst that seal is it easy to change? Sorry for the thread hijack Quote Link to comment Share on other sites More sharing options...
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