I'm pretty sure my reaction disk has slipped, this is based on reseaching on the site. I have a question, Do I have to take the brake booster off to try and repair or can I attempt to fix with it still on the car. It's a 73 240

Can be done while it's still on the car. Might be difficult to find and retrieve the disk while it's still on the car but I did mine that way.

You can pull the master cylinder off then pull out the seal and push rod with the booster on the car.

Try to fish around inside on the bottom of the booster to get the reaction disk. It may be difficult with the internal spring. If you can't get it,either use a disc from another booster or take the booster apart.

Edited June 24, 201212 yr by Blue

Thanks for the pictures. Hopefully and can find the disk.

I had the same problem. Took the booster off of the car and shook it and the reaction disk fell to the ground. Super glued it in place and now my

car stops perfectly.

http://forums.hybridz.org/index.php/topic/69706-reaction-disk-pictures-and-walkthrough/

Ditto on above......super glue it in place as in Phil's pic. Then if you have to take the push rod out to adjust, you won't have to fish it out again.

You should not use glue. Use grease instead to hold the disk in place while you reassemble the booster. The prodecure is described in the service manual.

Sorry Beerman but I don't agree. Give me one reason why grease is better than super glue. I had to pull my push rod out to adjust the rod recently (it was so tight, I had to put it in a vise). It was so nice not to have to have someone hold the brake pedal down so I wouldn't drop the disc again.....came out as a unit.....went back as a unit.

Ditto

I had the same problem. Took the booster off of the car and shook it and the reaction disk fell to the ground. Super glued it in place and now my

car stops perfectly.

http://forums.hybridz.org/index.php/topic/69706-reaction-disk-pictures-and-walkthrough/

Sorry Beerman but I don't agree. Give me one reason why grease is better than super glue. I had to pull my push rod out to adjust the rod recently (it was so tight, I had to put it in a vise). It was so nice not to have to have someone hold the brake pedal down so I wouldn't drop the disc again.....came out as a unit.....went back as a unit.

My primary concern is how the rubber will react to the adhesive. If it has a bad reaction the rubber could change. The reaction disk is a spring and is part of what determines how the Master-Vac reacts to pedal pressure. If the rubber changes the assist curve will change and change the feel of the brakes. Beyond that it is only the formality of following the factory's instructions.

I use 3M Super Weatherstrip Adhesive.

Chuck

Ok I left the booster on the car and got the pushrod out, no reaction disk but when I feel inside the hole where the rod goes it feels like a rubber disk is in the chamber where the rod goes. When the brake pedal is pushed it moves forward and back. Is it possible it was glued to the other end? I don't want to remove the booster from the firewall unless it becomes a last resort. I'm a big guy and have trouble getting in there to remove. Is there another rubber piece in the booster or do you think it is my disc.

does anyone have a reaction disc they would be willing to sell me. please PM.

thanks