Brake servo repair

[ATE399J]

Firstly, is there a way of checking whether the brake servo is working correctly (apart form disconnecting it and going for a drive)? And, secondly, is home repair an option? I've heard that these things are almost impossible to get apart and once you have there appear to be about 9385349 difference variants only distinguishable by the pitch of the knurling of the sprocket push-rod lever pin (or something).

Forgot to say, it's the TR6 unit.

Edited by ATE399J on Wednesday 13th June 14:17

[ATE399J]

Car failed MoT on braking efficiency. Servo was U/S. When I replaced it it made little/no difference.

Stripping the master cylinder down I discovered that the piston was sticking half way up the cylinder and not returning fully "out". I was a little surprised since I had only replaced all the seals about a year ago and can only assume that the one on the main piston ass'y had swollen. Has anyone else had this problem? Are there fluid / seal incompatabilities that I am unaware of?

I replaced then all again and it seems to have solved the problem but will I be doing the same thing again next year? I presume that one seals kit is the same as another - or am I being naive?

Answers on a postcard to.......

[ATE399J]

Adrian,

OK, I see what you mean. However, the piston did move freely without the seal seemingly in any orientation although I understand that's not neccessarily a sign that all is well. Is there a straight swap with a modern unit (having JUST bought a new servo!)?

Phil.

[ATE399J]

Adrian,

I dispensed with the PDWA some time ago as I couldn't get a replacement seals kit. I have both front from one master cyl outlet and both rear from the other (can't remember which way round off the top of my head). So I guess I've already done most of what you suggest. My question still is does the Ford master cylinder fit straight on to the Triumph servo?

Phil.