big time brake issue help needed

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Joined
Jan 2, 2006
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hello all,

77' fj-40, had it for about a week, all is good except for the brakes. Sometimes they are great (not so much lately) most of the time they are so weak that im afraid i wont be able to stop. The brake warning light goes on most times i apply pressure to the pedal as well.

Any ideas on what to start with?
 
The brake light indicates a pressure difference front to rear, which usually means a leak. If you don't see fluid leaking the master cylinder may be leaking internally.
 
Pin_Head said:
The brake light indicates a pressure difference front to rear, which usually means a leak. If you don't see fluid leaking the master cylinder may be leaking internally.
As usual, Pin_Head's got it. I'm just chiming-in to stress that it's more important to make your cruiser stop than it is to make it go, at least from a safety standpoint. Figure it out and fix it before bad things happen.
 
Mr. Toad said:
As usual, Pin_Head's got it. I'm just chiming-in to stress that it's more important to make your cruiser stop than it is to make it go, at least from a safety standpoint. Figure it out and fix it before bad things happen.

my thoughts exactly, need to get this nipped in the butt. Took a better look at it and ther doesnt seem to be any leaking that is visible. guessing this means its a new master cylinder for me?
 
as well, i guess i should have stated that the pedal is going right to the floor most times.
 
and looking at it more, it seems that the front cup has rather dark fluid in it, and the back cup is looking VERY rusty. perhaps it needs a flush and bleed?
 
Yep what Pinhead and Toad said...it is leaking at the seal between the front and rear pistons. Eventually, it will deplete on resevoir and overfill the other. Replace the MC, flush and bleed.
 

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