Madmal Posted February 22, 2017 Report Share Posted February 22, 2017 Evening all, Thought i'd bleed my brakes as the pedal travel seemed excessive before the brakes pads bit. Hooked up the Gunson Ezybleed at about 10 psi, checked for leaks, none found, so filled up bottle with Dot 4 brake fluid. Reconnected pressure and the bottle started to empty. Cue lots of running around trying to find where the fluid was going but everything completely dry. No leaking anywhere. The bottle got to about a 1/4 then stopped emptying itself. I waited for a few minutes but all seemed well so carried on bleeding the brakes. Pedal now feels great but I'm not sure how the system could take so much fluid as the reservoir was full when i started. Any ideas? Cheers Mal Quote Link to post Share on other sites
Peter Cobbold Posted February 22, 2017 Report Share Posted February 22, 2017 Perhaps the pushrod/servo/m-c piston were not fully relaxing even with no pressure on the pedal. The bleeders pressure has now taken up that slack. Just a guess... Peter Quote Link to post Share on other sites
RogerH Posted February 22, 2017 Report Share Posted February 22, 2017 Hi Mal, it may be worth checking your front wheel bearings for excess play. This could give pad knock back and cause long pedal travel. The excess fluid may be in the servo unit. Failed master cylinder seals. Roger Quote Link to post Share on other sites
barkerwilliams Posted February 22, 2017 Report Share Posted February 22, 2017 (edited) Mal, Has it leaked into in the servo? Alan Roger - snap! Edited February 22, 2017 by barkerwilliams Quote Link to post Share on other sites
Peter Cobbold Posted February 22, 2017 Report Share Posted February 22, 2017 What volume of fluid disappeared? Quote Link to post Share on other sites
Madmal Posted February 22, 2017 Author Report Share Posted February 22, 2017 About 300ml but then stopped and has been fine since, although I've not been out on the road yet. Is there an easy way to check the servo for fluid? Cheers Mal Quote Link to post Share on other sites
Peter Cobbold Posted February 22, 2017 Report Share Posted February 22, 2017 (edited) 300ml ! - its not the slack in the piston/pushrod. Look for fluid dripping onto the carpet off the pushrod. http://www.buckeyetriumphs.org/technical/Brakes/Servo/Servo.htm Dont run the engine - if all 300ml are in the servo the fluid will 'lacquer' the bores/rings if it gets sucked into the engine. Peter Edited February 22, 2017 by Peter Cobbold Quote Link to post Share on other sites
RogerH Posted February 22, 2017 Report Share Posted February 22, 2017 Hi Mal, there was a post a couple of months ago about the servo filling up. I think he was in NZ. Have the MC seals ever been replaced.? They will wear out one day. Roger Quote Link to post Share on other sites
Guest ntc Posted February 22, 2017 Report Share Posted February 22, 2017 (edited) If you used there tank to fill it you will have to much fluid in the reservoir . Edited February 22, 2017 by ntc Quote Link to post Share on other sites
KiwiTR6 Posted February 22, 2017 Report Share Posted February 22, 2017 Hi Mal. My booster had 200+ mls of fluid in it when I stripped it a couple of months back (you can see the tide mark in the photo). In my case the MC had been professionally recon'd with a stainless sleeve, but the clowns hadn't cleaned rust from the seal groove (or grooves - I sent it to another repairer to diagnose and rectify) allowing fluid to track through the inner bore of the seal(s) and get sucked into the booster. The previous owner must have wondered where all the fluid was going, but never mentioned it as an issue (but to be fair, he did mention a lot of other issues though). When I found the problem (just after buying the car) fluid was leaking between the MC and booster and dripping onto the new paint below with the inevitable damage this causes. If it doesn't leak out there, then I believe it will eventually leak out the back of the booster and into the footwell. Gavin Quote Link to post Share on other sites
Madmal Posted February 22, 2017 Author Report Share Posted February 22, 2017 Thanks for the replys, no sign of any fluid leaking, so keeping a watching brief.. Mal Quote Link to post Share on other sites
barkerwilliams Posted February 22, 2017 Report Share Posted February 22, 2017 Mal, Incentivised testing needed. fill reservoir to point that you can check. Get can of lager and sit in car, start engine sit in car and push brake pedal bl@@dy hard and hold for 20 seconds, release pedal. Open beer and take modest swig. repeat until all beer gone, perhaps 40 cycles. Turn engine off, and check fluid level, it should not have moved, not even a nat's. If the level has dropped then it's leaking. Alan Quote Link to post Share on other sites
Madmal Posted February 22, 2017 Author Report Share Posted February 22, 2017 That's my sort of testing! Might be better in the summer.... Quote Link to post Share on other sites
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