Hello All,

I have a friend in Kuwait who has a 1990 Classic that needs a rebuild on his brake servo.

Can anyone recommend a decent company that could do this for him?

Thanks in advance.

Dave

Bump - any thoughts people?

Looking like it may be non serviceable according to other sources.

If the two halves of the outer casing are crimped together, it can be a nightmare to open and re-crimp without causing a lot of damage, and difficult to obtain a good seal, specialist tools may be required. If the two halves are clamped together by tightening the bolt on a clamp then it can be easy.....then a big 'if you can get spares'
May be easier to just source a replacement.

Because they're a safety item, the manufacturers (Probably Girling or Teves) never made the servo to be servicable or made spare parts available.

You might be able to prise the crimps undone in the metal "shells" to release the diaphragms & take the shells apart. Putting the back together, would be a much bigger challenge, needing some sort of suitable clamp rings to clamp the shells & diaphragm together (while sealing) & then push the crimps back in place.

Having been involved in the development of similar parts decades ago, the most likely internal wear items are :
1 - the rubber "reaction disc" &
2 - the rubber control valve.
The reaction disc looks a very simple part, but if replaced with an aftermarket item (if one could be found) with any difference in the external diameter or rubber hardness (flexibility), the braking performance could be horrible.
The control valve is a much more complex part & probably very hard to "copy" even remotely well. Again, different dimensions or rubber hardness would have very significant effects.

The diaphragms can fail, but it's very unusual unless a petrol engined car has been backfiring badly through the intake system AND the vacuum Non Return Valve has been defective. Then petrol contamination can cause diaphragm swelling / failure.

I agree that a good second hand unit is a much better proposal.

PS The most typical failure point is actually the separate vacuum Non Return Valve - allowing vacuum to leak away & reducing servo assistance until either the vacuum pump (Diesel engines) or engine (petrol engines) has generated maximimum vacuum again. Paul,
2001 Discovery 2 TD5, 211,000 miles & climbing
2006 FFRR TDV8 Vogue 151,000 miles & now sold
Member of Midland (Land) Rover Owners Club, www.mroc.co.uk

Last edited by Pawl on 10th Jul 2023 12:08pm. Edited 1 time in total

Many thanks chaps.

I will pass on your advice to my chap in Kuwait.

Dave