TR8 Brake Booster Problems

[RJS]

Car is 1980 factory TR8 Carb.

When I push in the brake pedal, there is a continuous hissing sound. Takes a lot more pressure to stop the car (no more power for the power brakes). If car is idling when I press the brakes, RPMs go up a little when I hear the hissing sound.

Obviously there is a problem with the brake booster. I will have a helper in a few days to dig deeper (I cannot press the pedal and mess with the booster at the same time).

Is this something I can rebuild? If yes, where can I get a rebuild kit? What is involved with rebuilding a booster?

If I should not try to rebuild, where can I find an affordable brake booster replacement?

Thanks,
Rob

[Peter Nuss]

Don't really need a helper to dig deeper. You have a bad brake booster. I can tell you exactly what's leaking but, it won't matter much. It needs to be rebuilt.

You can find a rebuid kit on ebay or contact S&S in the UK. Probably some others also.

For $20 a year, join the TWOA. Some blowhard wrote a tech article on how to rebuild your booster in your own garage a few issues ago. Where to send the booster for replating etc.

You can also buy a rebuilt one from the two US suppliers of TR8 stuff for around $300 plus shipping two ways. But, it will be painted black instead of cad plated. I thinking it's on a exchange program, so you loose your booster for one that's maybe not so nice as a dry climate one.

Good luck with your project

TR8

[Hasbeen]

Check the hose first. It could be split particularly near on one of the fittings at either end, so sucking air, & that is the sound you're hearing.

I have heard hoses sucking air a couple of times, but have not heard any his from a booster even when the diaphragm was split, although this could depend on how big the split is. A big split would probably not be noisy.

How is the thing running? It should be out of tune if one inlet is getting air after the throttle butterfly.

Hasbeen

[jclay (RIP 2018)]

Woody did mine and redid the cad plating. Here is the one that Woody did for my TR7:

Picture at bottom of page;
http://www.jclay.me/jclay/Big_Brakes_2.html#6

Clay

[url="http://www.jclay.me/"]My Triumph Site[/url], [url="http://www.triumphtechnical.me"]Technical Stuff[/url], [url="https://docs.google.com/folder/d/0B8MWEvqOpX3udEF4SmFQUW9RS09hbU5uNW5Wd0xrUQ/edit"]My Public Folder[/url],

[RJS]

Thanks for the info guys.

Would it be smart to rebuild the brake master cylinder at the same time, or should I leave it alone (if it aint broke, don't fix it).?

Rob

[jclay (RIP 2018)]

Get a brass sleeve installed!

http://www.applehydraulics.com/brakes.htm

Clay

[url="http://www.jclay.me/"]My Triumph Site[/url], [url="http://www.triumphtechnical.me"]Technical Stuff[/url], [url="https://docs.google.com/folder/d/0B8MWEvqOpX3udEF4SmFQUW9RS09hbU5uNW5Wd0xrUQ/edit"]My Public Folder[/url],

[kstrutt1]

If it is the same as the 7 the seal between the master cyl and the servo is often the culprit, this can just about be done by undoing the bolts and pulling the cyl forward.


Kevin

[RJS]

Quick update.

I got the rebuild kit from S&S and rebuild the brake servo today. Everything is good again.

Thanks Peter for the advice. I did finally join the TWOA. The article on rebuilding the servo was very helpful (even if the writer was bit of a blowhard).

Rob