Glynn Posted December 29, 2016 Share Posted December 29, 2016 Hydrovacs does anyone have a good source of parts(in the uk preferably) or info on bleeding and setting up. had a look online and it sounds a bit like a pain in the **se. Quote Link to comment Share on other sites More sharing options...
Runflat Posted December 29, 2016 Share Posted December 29, 2016 Do you mean Autovac? Parts and advice here: http://www.autovac.co.uk/ Quote Link to comment Share on other sites More sharing options...
Glynn Posted December 29, 2016 Author Share Posted December 29, 2016 Hi runflat no it's a vacuum remote brake servo unit fitted to trucks wartime to the fifties . Quote Link to comment Share on other sites More sharing options...
Pete Ashby Posted December 29, 2016 Share Posted December 29, 2016 Hydrovacs does anyone have a good source of parts(in the uk preferably) or info on bleeding and setting up.had a look online and it sounds a bit like a pain in the **se. What make of truck are you working on ? Pete Quote Link to comment Share on other sites More sharing options...
Hoseman Posted December 29, 2016 Share Posted December 29, 2016 What make of truck are you working on ? Pete Some post war cars used hydrovac wiper units, early Ford's etc Quote Link to comment Share on other sites More sharing options...
paulbrook Posted December 29, 2016 Share Posted December 29, 2016 Assuming that we are talking about a remote vacuum brake servo are we talking about a Clayton Dewandre or other another make? Pretty sure I have the setting up instructions for the former, and maybe others too - I will have a look. Even then the master cylinders attached can vary. As for parts I am not sure if there is much that can go wrong with the servo part, other than a piston failure. Virtually everything else is in "strip clean and carefully reassemble" territory. Provided that the master cylinder is relatively standard refurb kits can be found for them. Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted December 29, 2016 Share Posted December 29, 2016 (edited) Some post war cars used hydrovac wiper units, early Ford's etc The word 'hydrovac' is the trade name of a vacuum boosted hydraulic brake unit made by Bendix. The wiper motors were pure and simple vacuum motors. It is normally the US made trucks that were fitted with Hydrovac, (GMC and the like). British lorries were normally fitted with Clayton Dewandre vacuum units as Paul has mentioned. There are two issues on the Clayton units, one is the leather piston seal either dries out and / or wears out and the other is the rubber seals in the vacuum valve. Adjustment has to be précise if dismantling this part. regards, Richard Edited December 29, 2016 by Richard Farrant forgotten to add makers name Quote Link to comment Share on other sites More sharing options...
MatchFuzee Posted December 29, 2016 Share Posted December 29, 2016 This document covers piston and diaphragm Hydovac bleeding:- http://www.dspartscompany.com/DocumentsCenter/Hydraulic%20Brake%20edit.pdf Quote Link to comment Share on other sites More sharing options...
STRIKE AND RETURN 460 Posted December 29, 2016 Share Posted December 29, 2016 I have a series 1 Hydrovac for sale. This is the type that was fitted to very early Gmc etc and is a air boaster and does not have brake fluid flowing through it just air. This is a NOS item. Quote Link to comment Share on other sites More sharing options...
Glynn Posted December 29, 2016 Author Share Posted December 29, 2016 (edited) Thanks match that is good info. Strike mine is vacuum and brake fluid so sounds like yours won't do. thanks Paul hopefully that will do it. Edited December 29, 2016 by Glynn Quote Link to comment Share on other sites More sharing options...
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