![]() ![]() I don't understand the detail but I'm sure youre right. ![]() It may be in the case of the TRW master cylinder that the residual pressure is maintained at too high a level so preventing that action. During operation the piston seal is lozenged and when the pressure is released to seal relaxes and due to its grip it pulls the piston back a small distance to release the grip. With disc brakes the main piston seal acts to retract the piston back into the cylinder when the pressure is released. I certainly would not buy another TRW one. Solved by adjusting the rod until they just released. The first one leaked straight out of the box so was returned and the second one arrived and I had that problem. Graham, thats exactly the problem I had with the second TRW one I had. I have bought a new Caparo master cylinder which I hope will work straight from he box. 1964 AUSTIN HEALEY SPRITE MASTER CYLINDER FULLThe rear drums release as they should, apparently because the springs are able to return the shoes, but obviously there are no springs on the discs.Īpparently there is a fix that involves drilling the tiniest of holes on the relief valve but I don't know the full details as thats not for me. When I press the brake pedal and then release it, the front discs remain locked for over five minutes. I bought it in 2010 and it has been sitting in a draw, so cannot say whether current production run is better.įor those that are interested, the problem is with the relief valve. Yesterday, I fitted a TRW master cylinder on my MGA and had a problem. Your old master cylinder bodies, even if the cylinders are pitted, are probably suitable for sleeving by a Co such as Past Parts although the service is not cheap. Some three years back I had a complaint from a Frogeye owner who tried three TRW master cylinders before settling on one that worked O.K. If you consider buying new then do first look at MGA Guru website regarding problems with TRW brand master cylinders. ![]() Probably works out cheaper anyway - under 50 quid on EBbay. Unless you enjoy the challenge of messing about just buy a new one. Doesn't harm rubber parts and doesn't remove any good metal, only rust. 1" dia! So that wouldn't go the length of a master cylinder, would it? (it does now)Įvaporust is what I use. but the cone which seats the back ends of the hone legs is approx. How would you go about cleaning it up? The bores are the easy bit.īTW, my new Sealey multi-purpose hone set goes down to 3/4" dia. One of them is very good, but it's also the rustiest throughout. MG Midget and Sprite Technical - Refurbishing Twin Master Cylinder I've got three 7/8" twin master cylinders, and I've been cleaning them up and test-honing them to find which is the least pitted. ![]()
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