jeffer949 Posted December 8, 2007 Share Posted December 8, 2007 ok ive been having some problems with my brakes and through searching have learned about the reaction disk coming out. so i took off my brake booster to check it out Then i realized i didnt know what to check for. some one said something about it rattling around would this be like a washer rattling around in the booster or more of a faint rattle... Also does anybody have the messurement for length the 2 shafts going though the booster is supposed to be? cause it would be shorter if the reaction disk had fallen out correct?? Last but not least what is the best way to take it apart if the disk has come out with out the special tool that is in the FSM? i tried a pry bar and a large screw driver but i dont think i was getting enough force by myself.. any help would be appriciated thanks Jeff Quote Link to comment Share on other sites More sharing options...
datsun40146 Posted December 8, 2007 Share Posted December 8, 2007 When my reaction disk fell off all I did was hold the booster so that the master cylinder side was pointing up, pull the plunger up as far as it would go and then shake it violently. The disk fell down into the "well" in the center and everything worked out fine. Make sure after you shake it that you push the plunger back down and keep it down so that the disk doesn't fall back out. Quote Link to comment Share on other sites More sharing options...
datsun40146 Posted December 8, 2007 Share Posted December 8, 2007 BTW you do know the symptoms of a reaction disk coming loose right? That way you’re not trying to fix something that's not broken. IF the reaction disk from the booster is out, when you tap the brakes, it'll be like you PUNCHED the brakes. Then you can't use the brakes because it's like and on/off switch. IF your diaphragm has a hole/tear your brakes will be very much harder to push, some where on the order of 4 times more energy, IE 30 pounds normally (guess), and then 120 pounds with out vacuum assist. IF your brakes have play in them you could have several issues. 1. Your pads are worn and need to be replaced or adjusted 2. Your brake lines have air in them and they need to be bled 3. Your pushrod on your booster may be too short and may not be engaging the MC properly. :)"quoted from Chevyman":) With engine off................pump pedal a few times to eliminate vacuum in booster........it will (read - should - ) get stiffer pedal after a couple of pumps. Then......with foot on pedal holding slight pressure, start engine.......manifold vacuum should fill booster and pedal should drop towards floor - about an inch (+or-). If this happens, and you don't have any symptoms described by Siz75 above, you can conclude that booster is in decent shape. Quote Link to comment Share on other sites More sharing options...
jeffer949 Posted December 8, 2007 Author Share Posted December 8, 2007 yeah i know the symptoms i read one of your posts while searching. and it was out. i was able to take out the push rod with the seal and its nto in there and i can see it bouncing around. now to just get the dang thing back in place.. thanks a lot Quote Link to comment Share on other sites More sharing options...
jeffer949 Posted December 8, 2007 Author Share Posted December 8, 2007 allright got it back in place and everything bolted up. and it fixed the problem thanks Quote Link to comment Share on other sites More sharing options...
datsun40146 Posted December 8, 2007 Share Posted December 8, 2007 Great glad I could help. Quote Link to comment Share on other sites More sharing options...
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