The other day I slammed hard on my brakes and almost immediately afterwards my car began to idle really rough. When I disconnect the booster hose from the manifold and plug up the hole it idles perfectly. I also get a faint air leak sound coming from beneath the dash by the brake pedal. Any ideas 24 valve guys who are running the modified Porsche 944 booster??
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If you are getting vaccum leak from the booster line, and it is connected correctly to the booster & intake mani, then yes, you can assume bad booster. Although you should be able to notice loss in braking power or some kind of change in braking.
I'm also running a modified 944 booster, and I'd like to chime in and say, while it was much much easier to just swap that in, rather than drill the firewall, I went with 944 over e21 due to braking feel. Threads I had read said 944 offered better breaking assist in comparison to e21, but I get very little braking assist in my car w/ 944 booster. That being said, I suspect that the check valve on the booster vaccum line might restrict vaccum flow to much, and reduce braking power. Sorry to thread jack, and back to your question- probably the booster if you can hear a leak somewhere by your feet and there's a vaccum leak happening in or after the booster vaccum line
Cheers -
I get reasonable braking power still. Frankly I haven't noticed a difference. Luckily the 944 booster is a fairly common part. Thank you!Comment
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