Thread: Brake Master Cylinder repair

I did it once, and wasted my money. The sleeve had worn where the seals sit, allowing the fluid to squirt past.

Reckon I got a new unit from the mob in Tassie for not much more than the kit.

yes but usually for the reason given in the preceeding post it usually doesnt last long unless you also have the honing gear to sort out the bore.

Originally Posted by Blknight.aus

yes but usually for the reason given in the preceeding post it usually doesnt last long unless you also have the honing gear to sort out the bore.

.. or a stainless steel reline

but, as said earlier - a new one will save a lot of heaadaches

Get a new one, either from Paddocks in the UK or from someone in Oz.

Been down the path of stainless sleeving, only to be confronted with a seized shuttle valve and no o rings for that supplied in the kit.

Time wasted mucking around was a lesson learned.

DL

Originally Posted by paulrr85

Has anyone repaired their brake master cylinder using the repair parts (new spring and seals). Is there an easy way to do it? I want to give this a go before getting a new master cylinder.
Thanks
Paul

I'll be doing mine over the chrissy brake don't no what yr model yours is mine's a 55 107 triangular base 3 bolt one cant find a new one in aus plenty of 2 bolt ones available best price i saw $165 (probably the way to go)but i'm going to go for refurb of my old one $200-260)glutton for punishmemt.good luck, markus

When I was in the mechanicking game 30+ years ago, overhaul of various brake and clutch cylinders was a job you did every day. It has fallen by the wayside now as labour costs more than parts.
If they are a steel cylinder, they can be honed with a suitable size cylinder hone. If you don't do this you are wasting your time. Alloy cylinders can't be honed and are a throw-away. Sleeving came into vogue about 20-odd years ago as a way of rescuing expensive cylinders that are either too far gone for the hone or are alloy. I believe the bore of a sleeved cylinder can be honed.
Tool shops still sell cylinder hones. A decent one might be fairly pricey. Use plenty of CRC/RP7 type stuff whilst honing and keep the hone moving in + out whilst rotating to give a cross-hatched finish (although the finish should be too fine to see any cross-hatched marks). Use brake fluid as a lube when reassembling with the new rubbers.

Last time I looked , although several years ago, a kit was almost as much as a new cylinder.
New cylinder every time.
Regards Philip A

Originally Posted by PhilipA

Last time I looked , although several years ago, a kit was almost as much as a new cylinder.
New cylinder every time.
Regards Philip A

To put this further into perspective a new genuine M/C, 5 x braided brake lines, full set of mintex pads, full set of pistons and seals, spring clips and split pins was about $480 delivered from Paddocks about 5 years ago.

cheers, DL