brake fluid on floor.

[rsh4364]

My 85 M1009 is leaking brake fluid onto drivers side front floor in the fuel, brake pedal area,not alot but enough that id like to get it fixed,brakes feel and work fine..any experiance or thoughts welcome..The truck is coming along nicely thanks to this site,

 

[porkysplace]

Master cylinder and/or brake booster.

 

[Vhyle]

Master cylinder and/or brake booster.

Yup. And the sooner you fix it, the better. ANY amount of brake fluid leak is a no-no in my book.

 

[rsh4364]

agreed,thinking master since leak is inside,is this a reg. master for a 85 k-5 diesel,or do i need something special ?

 

[jw4x4]

Nothing special.

 

[rsh4364]

thankyou,Ill start shopping now..

 

[o1951]

If it works good, and need to save $$, you can do it yourself with a rebuild kit.

 

[FireFighterHill]

make sure you cleanup all that brake fluid ASAP because it eats paint.

 

[rsh4364]

im finding multiple part numbers, does it have hydra boost?if anyone has part numbers id be grateful, im gonna replace master and booster, im thinking..thanks ..

 

[FireFighterHill]

http://www.steelsoldiers.com/showthread.php?27427-Cucv-Wiki

 

[cpf240]

Yes, it has hydroboost. I'd suggest you take a look at the -20p and -34p TMs, as they will have the GM part numbers that the auto parts store can use to look them up. Otherwise, just tell them its an '84 K5 Blazer. Yes, I know you said its an '85, but all CUCVs are built based on '84 parts.

 

[rsh4364]

okay its hydra-boost,and gonna replace booster and master cylinder,but why is it leaking inside but not outside?I just dont want to replace all this and still have a leak, is it maybe just an o-ring on shaft going into booster? brakes work fine other than leak..

 

[cpf240]

Are you willing to risk your life, and the lives of others, just fixing the one o-ring you know is leaking? Don't cut corners on brakes!

 

[eagle4g63]

Here take a look at this page and really look at how a brake cylinder and booster look internally...........with that said think about this..........master has a plunger through the back......it starts to leak......it is bolted and sealed to the booster so fluid goes into booster..........now follow the drawing.........as the booster gets fluid in it, it has no where else to go but out the back........again, bolted and sealed to your cab.......the only place to leak IS inside the truck.......

http://www.autoshop101.com/forms/brake05.pdf

 

[eagle4g63]

Also............brakes WILL be fine until there is not enough fluid to NOT be fine...........don't risk it and just replace the parts.........when it is too late to be fine, no ones life is worth it.

 

[rsh4364]

thanks again guys, you are right,truck coming along to well to go cheap now,will do master and booster at same time..

 

[rsh4364]

discovered today not brake fluid leaking on floor but pwr steering fluid,gonna replace booster and master cyl.,how hard is this job?