Moss Motors, Ltd

I bought my '77 B from a mechanic that specializes in higher end LBC' s - both repairing and restoring.  When I bought it, he told me right up front that the master cylinder was bad.  I'm just going to take him at his word and replace it.  Can someone tell me how difficult it is to rebuild one.  Is it just a matter of time and parts, or is there machining, etcetera involved?  Should I try to do it myself, or does it just make sense to buy a new/rebuilt one?

Thanks for any advice.

Hi,

it's quite easy to rebuild it if there's no structural damage. Moss sells a seal kit with all the necessary oil seals to reassemble the master. Before ordering the kit, check your master cylinder for marks to determine if it's the older or newer version (because there are two types. you can see both types in moss's site). After that, you can remove and disassemble the master cylinder to determine if it's good enough for rebuilding. If you find a small leak in the reservoir, you may be able to repair it but if you discover any relevant corrosion to the piston (inside) you should replace it. Apart from that, it's a simple task of replacing the oil seals. Go for it!

 regards,

Rui Ruas

 PS: If you don't have it already, you should buy the Haynes "Owners Workshop Manual" (ISBN: 0 85696 623 1). It explain almost everything in full detail :-)

Well, opinions are like bellybuttons---everyone's got them.

 My suggestion is to just replace it with a new one.  Forget about rebuilds.  In my mind, brakes are one thing you don't want to skimp on.  Safety is top priority.  I'm not saying spend thousands on one of those fancy big brake kits, but I wouldn't bother rebuilding brake masters, wheel cylinders, etc.

 G'luck :)