Having problems with your 1990 Toyota 4Runner ?

Master cyl installation

\015 OK this may sound stupid. Is there suposed to be a gasket between the MC and the power booster and could that be why I cant bleed a drop through the front brakes? I only ask because no gasket came with the MC and one isnt mentioned in the book and one wasnt on it before but I saw a diagram in another section of the book that shows a gasket. \015\012\015\012Is there a gasket and could that be why I cant bleed the front brakes?\015 Posted / edited by AnonymousUser on : 20-09-2021

Answers :

I've seen some masters mounted against a foam gasket but the gasket does nothing...fluid is contained by the internal seals inside the unit.\015\012To bleed any brake system, you should always begin at the master if the unit has run dry or is new. Open the line at the unit, press down on the pedal, hold it there and close the line. (some units come with a bleed valve right above line fitting) Then bleed brakes as normal...rr,lr, rf, lf. sometimes you may need to remove the bleed screw entirely if no fluid comes out (I clean them with a small drill bit if plugged up with rust and dirt) Keep in mind, that some rebuilt masters can be defective, but don't return yours till you have made every effort to do it correctly first!
Repair Help & Product Troubleshooting for 1990 Toyota 4Runner

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