Hi,
I have a 1990 325i(S). It started life as an auto and someone later converted it to a 5 speed with lsd.
When I first bought the car there was an issue with the brakes. It dropped to the floor and barely stopped. I put in a new MC and it felt much better. However, I personally still feel there could be some improvement in the braking performance. I may just be spoiled with fixed caliper setups. Fast forward some time, and I happened to be talking to an engineer friend who loves E30s. He suggest I look at the check valve to the brake booster. First I've heard of a check valve before, so I started digging.
Turns out a failure of a check valve can either lead to a super stiff pedal, or soft one. Great. I decide I should take the valve off, and inspect it. However, while looking at the hoses I came across what looks to be two check valves. A quick google shows there are two types of check valves used on e30s. Apparently there is one for an automatic, and another for a manual.
Auto:
Manual:
The photos of my car are here:
I have the 3 tee check valve going to the throttle body, automatic version, but down by the booster I also see a 90 degree fitting that appears to also be the check valve for a manual car.
I'm not super familiar with these cars, so I'm certain if the 90 degree fitting is a manual check valve or if those check valves would normally replace the 3 tee check valve in the same location. Like this: https://www.r3vlimited.com/board/sho...d.php?t=116665
I'm unfamiliar with these cars and because it was an auto to manual swap, I want to be sure that I'm no confusing a standard 90 degree fitting on the booster with a check valve.
I have a 1990 325i(S). It started life as an auto and someone later converted it to a 5 speed with lsd.
When I first bought the car there was an issue with the brakes. It dropped to the floor and barely stopped. I put in a new MC and it felt much better. However, I personally still feel there could be some improvement in the braking performance. I may just be spoiled with fixed caliper setups. Fast forward some time, and I happened to be talking to an engineer friend who loves E30s. He suggest I look at the check valve to the brake booster. First I've heard of a check valve before, so I started digging.
Turns out a failure of a check valve can either lead to a super stiff pedal, or soft one. Great. I decide I should take the valve off, and inspect it. However, while looking at the hoses I came across what looks to be two check valves. A quick google shows there are two types of check valves used on e30s. Apparently there is one for an automatic, and another for a manual.
Auto:
Manual:
The photos of my car are here:
I have the 3 tee check valve going to the throttle body, automatic version, but down by the booster I also see a 90 degree fitting that appears to also be the check valve for a manual car.
I'm not super familiar with these cars, so I'm certain if the 90 degree fitting is a manual check valve or if those check valves would normally replace the 3 tee check valve in the same location. Like this: https://www.r3vlimited.com/board/sho...d.php?t=116665
I'm unfamiliar with these cars and because it was an auto to manual swap, I want to be sure that I'm no confusing a standard 90 degree fitting on the booster with a check valve.
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