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Joined: 7/05/2009(UTC)
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I recently had the original master cylinder and vacuum servo unit rebuilt on my 72 Holden SS (253). But when I apply the brakes, the car doesnt slow down progressively as it would normally. And when I apply full pressure to the brake pedal, it suddenly nose dives to a halt.
The brake linings (front and rear) are in top condition.
So what's the problem? Any advice/suggestions appreciated!
Davo
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Rank: Member
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Hi Davo57. It could have a problem with the reaction disc that sits behind the pushrod in the booster. When that is not fitted or damaged the symptoms are like what you have described in your post. I would also be interested in having a chat with you about your SS. I am a SS owner myself and I am part of a SS owners group and I have also started a couple of SS related web pages Main SS web address http://s300.photobucket.com/albums/nn14/HQSS1972/
This now has around 950 images of SSs, including group members cars, road tests from the 70s and all other SS related things that we can find. Old SS web site http://www.freewebs.com/hqss/index.htm
My SS is here http://gallery.oldholden.com/HQ_SS/ss_001/
We are trying to track down any information we can find on any SSs past or present that people have been associated with, so I would be really interested in talking to you about your SS. If you or anyone else would like to talk to me about SSs feel free to use this email address. My email address [email protected] Cheers Paul.
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Rank: Member
Groups: Registered
Joined: 7/05/2009(UTC)
Posts: 125
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I know you say its the original one off your car , but maybe the brake place gave you a change over ? As if its the correct square top cast iron big nut type the HQ onwards use a deep hole rear piston and the HKTG (oval lid type )uses a shallow hole piston . Unfortunately if a brake place has a few hanging around they can mix and match the pistons and front nuts etc and as the pistons fit between the 2 many places dont check the pistons and fit the wrong rear one . Just a thought as the HKTGused the square top HQ type as a replacement from Holden in the early days but had the shallow rear piston . Maybe just worth checking . Good Luck
Everything in life has its price
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