411 Master cylinder bore specs

[Peter Grace]

Thanks everyone.

Nick - I have emailed PastParts thank you. I have also asked Bristol Cars and SLJ.
Greg and Byrn - thanks will check out the LandRover and Jaguar alternatives. This might be the fastest route.
Dorien - thanks too for your help. I think the mechanic is just trying to understand the job a bit better, it's his first time working on the car (or any Bristol I suppose)!

P

[412usa]

The Bristol manual does not recommend re boring master cylinders. Does anybody know why

[GREG]

You can get a new one for £50 quid if you shop around -- throw it in the bin and fit one and be happy for another 30 years !! Or type in Bristol 411 master cylinder in eBay and pay top price -- but at least that gives you the part number to show local Land/Range Rover Specialists , wherever you are in the world

If the master cylinder has gone and the rest of the brakes are the same age, you will be replacing the servo's and callipers soon! Type 8 Lockheed servos and new callipers available

[GREG]

Zeuss do replacement new callipers at around £350 / pair

I thought I would add the extra detail to avoid the answers from people on holiday or don't have information to hand / not sure etc -- so what's the point in writing anything !!?

Make it a forum rule to only answer a question if you KNOW the feckin answer !!

My Grumpy Old Man answer of the day :-)

[Kevin H]

Originally Posted by 412usa

The Bristol manual does not recommend re boring master cylinders. Does anybody know why

So they could sell you a new one? ;-)

Maybe there isn't much cost difference between reconditioning and replacement.

It is of course quite an important part of the car!

My understanding is that when they recondition these things they usually re-sleeve the bore so that it is returned to it's original diameter.

Of course you are totally dependent on the quality of the service provided by the people who do the reconditioning, so maybe that's why they recommend you simply replace it.

[Bryn Tirion]

Originally Posted by 412usa

The Bristol manual does not recommend re boring master cylinders. Does anybody know why

The master cylinder bore and therefore the swept volume is matched to the calipers and the braking surface area at the design stage. Although a master cylinder rebore is unlikely to affect braking greatly, nevertheless I am sure the Bristol lawyers advised them to cover their bottoms, since one never knows what some idiotic Future Owner is likely to do.

Having said that, Bristol always seemed to get components off other people's shelves, so getting hold of a NOS or brand new master cylinder is certainly going to be cheaper and more straightforward than a rebore..... what seal kits do you buy for a rebore? Yes, a reline is more likely than a boring out, but what a needlessly complicated solution to a simple problem!

[GREG]

Originally Posted by Peter Grace

Thanks everyone.

Nick - I have emailed PastParts thank you. I have also asked Bristol Cars and SLJ.
Greg and Byrn - thanks will check out the LandRover and Jaguar alternatives.

P

What Jaguar alternatives !!!!? None