BEEDZ Posted February 1, 2012 Share Posted February 1, 2012 HELLO.Ok i have the annoying hissing when i apply the brakes and after i have taken my foot off the brakes on my 1977 Opel Manta 1.9sr.Not only that the engine revs drop making it nearly stall?I was wondering if this could be down to the NRV or do you think that the servo is just US? any help would be thankfully received. Quote Link to comment Share on other sites More sharing options...
andyc Posted February 1, 2012 Share Posted February 1, 2012 it sound like it could be either the Vacum hose or the servo. Cheapest option would be to fit a new hose and valve, if that doesn't cure it then it could well be the servo thats gone Andy Quote Link to comment Share on other sites More sharing options...
spiney_norman Posted February 1, 2012 Share Posted February 1, 2012 My Cav did the same when the servo was rusted through. Worth checking! Quote Link to comment Share on other sites More sharing options...
monzta Posted February 3, 2012 Share Posted February 3, 2012 I have experienced that a faulty vacuum valve for the brake servo gave me this issue years back. Try that first as its a cheap part, and check the hose. Quote Link to comment Share on other sites More sharing options...
BEEDZ Posted February 3, 2012 Author Share Posted February 3, 2012 Thanks to all im not ignoring you! ive changed NRV, hoses seem ok but should maybe change to be sure but at the mo no change. Although the old valve was quite hard to blow through could maybe do to go for a drive but only when better weather permits thanks again. Quote Link to comment Share on other sites More sharing options...
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