Re: ANOTHER #%*!:( BTV failure

Posted by John Payne On 2010/10/17 0:54:28

I think this is probably my last comment on this thread as I don't have sufficient technical knowledge to add anything of value. However, I would like to say that I have improved the amount of boost to the BTV and, as a consequence, reduced the amount of peddle pressure required of my ageing right foot. The problem, or a large part of it, lay in the type of brake hose I used.

To explain in more detail, when I fitted the reco'd BTV I also fitted new brake booster vacuum hose. It's branded 9mm ID and complying with SAE J1403 standard, however its OD is about 2mm less than the stuff I took off. Yesterday I bought some more hose, this time the bigger OD stuff and branded 11/32", and fitted that. It too states that it complies with SAE standard J1403 and, as 11/32" is 8.73mm, I assume the difference in performance has something to do with the wall thickness of the hose as there is nothing else obvious to me.

Although still a little on the firm side, I am a lot happier. Thanks to everyone who offered advice - I really appreciate it. Cheers, John