hard brake pedal 1982
Thread Starter
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
hard brake pedal 1982
on my 82 when i put on the brakes the pedal is hard .it stops fine but you have to put a lot of pressure on it .the m/c is new and the brakes were bleed when i did the trailing arms .i think it is time for the brake booster .it holds vacuum but it does not work like it should.were should i buy a new one and any tips on taking out the old and putting in the new?
Le Mans Master
Joined: Jan 2007
Posts: 5,485
Likes: 7
From: Peekskill NY
All the vendors sell them.
You should buy the AIM for your year and the GM Chassis service manual if you don't have them.
Someone may be able to post a pic of the page from the AIM you need in the meantime showing the diagrams. Also most catalogs show the same diagrams in the AIM's. You can download Catalog PDF's from most of the vendors.
Glenn
You should buy the AIM for your year and the GM Chassis service manual if you don't have them.
Someone may be able to post a pic of the page from the AIM you need in the meantime showing the diagrams. Also most catalogs show the same diagrams in the AIM's. You can download Catalog PDF's from most of the vendors.
Glenn
Safety Car
Joined: Jun 2004
Posts: 4,652
Likes: 80
From: Lakeland Florida
There have been some good discussions on the forum lately about the brake booster and master cylinder combination. Because of the different years involved the brake booster will have either a long adjustment rod, or a short adjustment rod. The master cylinders will have either a deep pocket or a shallow pocket to match the brake booster. When you go to replace your brake booster check that the master cylinder and brake booster will match to each other for the correct combination.
kdf
kdf
Safety Car
Joined: Jun 2004
Posts: 4,652
Likes: 80
From: Lakeland Florida
Hello again
Here are some other steps to take to troubleshoot your brake booster.
1. With the engine off, pump the brake several times and hold the pedal down while starting the engine.
2. After starting the pedal should go down a little bit further. If it does not move, then check for engine vacuum to the booster.
3. Turn off the engine. Check the hose to the brake booster and inspect for cracks or breaks. Check the brake booster check valve. It should allow air travel only in one direction. You can test this by blowing into both ends of the valve gently. You should only be able to blow air in the direction of vacuum travel. If it flows both ways then the valve is bad.
4. Connect the hose to the carb or manifold vacuum. Start the engine and check for vacuum in the hose. Put your finger over the hose to test for vacuum. If no vacuum is felt then you have a different problem than the brake booster.
5. Attach the hose to the valve on the brake booster. Carefully look and listen for any hissing noises that may indicate a vacuum leak around the brake booster. If you can hear a leak then your brake booster is probably bad.
kdf
Here are some other steps to take to troubleshoot your brake booster.
1. With the engine off, pump the brake several times and hold the pedal down while starting the engine.
2. After starting the pedal should go down a little bit further. If it does not move, then check for engine vacuum to the booster.
3. Turn off the engine. Check the hose to the brake booster and inspect for cracks or breaks. Check the brake booster check valve. It should allow air travel only in one direction. You can test this by blowing into both ends of the valve gently. You should only be able to blow air in the direction of vacuum travel. If it flows both ways then the valve is bad.
4. Connect the hose to the carb or manifold vacuum. Start the engine and check for vacuum in the hose. Put your finger over the hose to test for vacuum. If no vacuum is felt then you have a different problem than the brake booster.
5. Attach the hose to the valve on the brake booster. Carefully look and listen for any hissing noises that may indicate a vacuum leak around the brake booster. If you can hear a leak then your brake booster is probably bad.
kdf
