lbrooks6174 Posted July 24, 2015 Report Share Posted July 24, 2015 I need to replace my brake master and power booster both are leaking. however i will be upgrading to front disc in the future. Here is my question, can i change over to the 280 master now and use it with the drums until I convert them over 1 Quote Link to comment
datzenmike Posted July 25, 2015 Report Share Posted July 25, 2015 A master can leak fluid but the booster can only leak vacuum. There's little to tell if the booster is 'leaking'. Possibly the engine will stumble at idle when you apply the brakes but very rare for this to happen. If the booster has brake fluid dripping, this is from the master. To test if the booster is working, pump the brakes several times to exhaust any residual vacuum. Step on the brake and hold. Start engine. Normally the pedal will drop an inch or so almost immediately after starting if it is working. Your '74 should have a 3/4" master. The 280 master is 7/8" or do you mean the 280zx master which is 15/16" and largest of all? The larger master is, the more effort needed to push the fluid. You will be going up 3/16" in size. As you have a brake booster this shouldn't be a problem. You may notice the pedal a bit firmer. 1 Quote Link to comment
lbrooks6174 Posted July 25, 2015 Author Report Share Posted July 25, 2015 meant the master is leaking fluid. as for the booster I have no power assist at all, but the strange part is I cant find any vacuum leaks. and yeah a 280zx master 1 Quote Link to comment
datzenmike Posted July 25, 2015 Report Share Posted July 25, 2015 Did you try this????? "To test if the booster is working, pump the brakes several times to exhaust any residual vacuum. Step on the brake and hold. Start engine. Normally the pedal will drop an inch or so almost immediately after starting if it is working." When there is no assist, the pedal will be extra firm and it's quite an effort to stop. There is a one way valve in line between intake and booster.... if on backwards, no worky. 1 Quote Link to comment
lbrooks6174 Posted July 25, 2015 Author Report Share Posted July 25, 2015 had it apart will check that valve thanks 2 Quote Link to comment
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