Mike Walker 0 Posted May 31, 2007 Just replaced front calipers, rubber hoses and drivers side brake pipe to master cylinder. Bled the back brakes (but not the compensator as I didn't know what/where it was) Bled the front brakes but couldn't get any fluid whatsoever out of either one. I can hear air escaping from around the master cylinder area when I push the brake pedal down but I don't understand this as it was fine before.. Any suggestions? Share this post Link to post Share on other sites
Mike Walker 0 Posted June 1, 2007 Bump, could air be leaking out of the BMC? Why did the back brakes bleed fine but the fronts didn't - is it a seperate system? Share this post Link to post Share on other sites
Richie-Van-GTi 72 2 Cars Posted June 1, 2007 no its not a seperate system, if your not getting anythging out the fronts then I suspect thats where the fault lies. How were you bleeding? pressure bleeder, 2 man or one way valve? Share this post Link to post Share on other sites
Mike Walker 0 Posted June 1, 2007 no its not a seperate system, if your not getting anythging out the fronts then I suspect thats where the fault lies. How were you bleeding? pressure bleeder, 2 man or one way valve? Two man method. I'm wondering if the rears had some fluid left in the lines that came through but the fronts didn't as both calipers had been off so it might just need a more severe bleeding? We did try the one side at the front about five times before giving up after still getting nothing through. I think the key is that noise i'm getting, it sounds like someones pumping a bicycle pump around the MC/ drivers footwell area when I depress the brake pedal (which travels right to the floor) It's a very audible noise....... Share this post Link to post Share on other sites
Richie-Van-GTi 72 2 Cars Posted June 1, 2007 they are known to hiss if all they are pushing is air. Invest in a pressure bleeder, only about £10 then you can just connect it up and crack a nipple open till it runs with fluid clear of bubbles then move onto next wheel etc. However given you have just replaced a lot of stuff up front it is possible you havent got a seal on one of the brake lines, a pressure bleeder will show this up straight away. " man method doesnt as the fluid is allowed to travel back up the line between pumps. Share this post Link to post Share on other sites
Mike Walker 0 Posted June 1, 2007 they are known to hiss if all they are pushing is air. Invest in a pressure bleeder, only about £10 then you can just connect it up and crack a nipple open till it runs with fluid clear of bubbles then move onto next wheel etc.However given you have just replaced a lot of stuff up front it is possible you havent got a seal on one of the brake lines, a pressure bleeder will show this up straight away. " man method doesnt as the fluid is allowed to travel back up the line between pumps. Cool, i'll get a pressure bleeder on my way home and give it another bash. Should I have put ptfe tape on any of the threads to get a seal? Share this post Link to post Share on other sites
elrikos 0 Posted June 1, 2007 no. the construction of the line should allow a good seal as it is. PTFE tape will not help as the brake line union is hollow so even with ptfe tape it'll laek through the centre. I'd check the quality of your flares and check for crap on the sealing surface Rich Share this post Link to post Share on other sites
