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Hi, noticed that my new master cylinder's reservoir for the rear brakes is going down and the master cylinder seems to be leaking out of the cap/lid. What could cause this? Seems to be a large amount of pressure on the pedal and I'm thinking this has to give somewhere so is taking the easy way out to the area of least resistance...the cap. Kelsey Hayes setup with a duel master cylinder, obviously. Has the adjuster knob thingy for the master cylinder (decrease/increase). Have had that in various spots but no difference to the fluid disappearing issue. Blockage? I heard somewhere you can give that adjuster the flick by changing the rear wheel cylinders? What would I have in there now and what do you change them to? Read so many conflicting stories. 29/32, 7/8, 3/4, 13/16, etc.Cheers.
what model car? 67 on can make do with falcon 13/16, pre 67 need 5/8
OK. So what is on it now? So 5/8 rear wheel cylinders off a GT falcon from 70s model?Also the leaking master cylinder issue. Any thoughts?
yep 5/8 if it has disc fronts, these are XY ute and GTHO rear cylinders, but you can't buy them off the shelf any more they are obsolete, you have to get them sleeved to that size. Ray at Knights old school brakes at Wynnum in Brisbane does them often
Thanks Shaun. Ray quotes $200 plus $20 for postage for future reference for anyone. He can make a little W or V shaped (can't remember which he said. lol) bit of metal to go into the rear brakes reservoir position, to stop the fluid coming out via the cap. Seems he has seen this issue many times before.