brake issue

[85sierraclassic]

so today and well yesterday i noticed my brakes felt funny, and then today they really felt like there wasnt much at all untill they were basicly to the floor. the brakes would work good but just nothing till almost full swing so i chech the fluid and its basicly bone dry. so i filled the master cylinder back up and that didnt do nothing, so i checked for leaks all over the place and everything was dry far as i could tell. then i decided to bleed the brakes and that went good on one side then thee other side desided to not let me get the bleeder opened, so i went and got a new caliper and blead that side.

well this is what i end up with. got the pedal feeling better but now it seems like it kinda pulls to one side but not bad, but the darn things gotta be losing fluid somewere and i cant seam to find it.

btw the trucks got hydro vac, instead of the vacume brake booster. so i dont think its possible to leak back in to it like a regular booster.?

[J Knight]

Usually master cylinders leak between it and the booster, the reason your truck is pulling is because you only changed one caliper, they need to be changed in pairs.

[Rogue_Alphonse]

The master cylinder is probably leaking. If you sort of pump the brakes, but just once, does the pedal feel normal the second time you press it?

That's basically what mine was doing. I found that all the missing brake fluid was what I thought was a bad valve cover leak. It was all over the frame.

Run your finger or a rag under where the master cylinder meets the hydroboost brake booster and see if its loaded with dirty brake fluid.

[85sierraclassic]

Originally Posted by J Knight

Usually master cylinders leak between it and the booster, the reason your truck is pulling is because you only changed one caliper, they need to be changed in pairs.

yea i probably should have changed both but thee other ones like 6 months old so i didnt worrie about it.

[85sierraclassic]

Originally Posted by Rogue_Alphonse

The master cylinder is probably leaking. If you sort of pump the brakes, but just once, does the pedal feel normal the second time you press it?

That's basically what mine was doing. I found that all the missing brake fluid was what I thought was a bad valve cover leak. It was all over the frame.

Run your finger or a rag under where the master cylinder meets the hydroboost brake booster and see if its loaded with dirty brake fluid.

all that looked dry, well untill i over filled the master a little lol

[Rogue_Alphonse]

Mine looked dry too until I bumped my wrist on the underside of it while fixing my shift linkage. THEN I realized my brake issue.

[85sierraclassic]

Originally Posted by Rogue_Alphonse

Mine looked dry too until I bumped my wrist on the underside of it while fixing my shift linkage. THEN I realized my brake issue.

lol well ill have to look at it again tomorrow