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Another stupid brake question
PostPosted: Tue Feb 25, 2014 7:32 pm Reply with quote
StretchASU
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This one has me a bit stumped...

Went to do the brake bleed on the truck. The brake fluid was brown and shitty so I ran about a quart and a half through the lines. Pedal has always sucked on this but it stops. I get pressure just before the floorboard.

Now..

I am getting fluid without air bubbles at all 4 corners and the LSPV. I can hit the brakes when the truck is off and it builds pressure. But as soon as I start the truck, the pedal goes right to the floor/truck stops just before the pedal hits the flood. I can pump the pedal 4-5x and the pressure builds back up a little. Once I let off the brakes I have to repeat the process to get any pressure. I can hear and see the front calipers moving the pad and grabbing the rotor and hear the hardware in the drums moving...the brakes just suck.

Only thing I have not tried is a master cylinder...just wanted to see if yall had any insight before I go swapping out parts.

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PostPosted: Tue Feb 25, 2014 10:06 pm Reply with quote
Yotaoffroad27
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Master would be my guess.


When I was trying to bleed my clutch on my Tacoma I was able to get some pressure, but it would always bleed off and not hold for more than a few seconds. I replaced the clutch master and its been gold since.

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PostPosted: Tue Feb 25, 2014 11:53 pm Reply with quote
BUBBA
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Sounds like a bad master cylinder

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PostPosted: Wed Feb 26, 2014 9:07 am Reply with quote
DAWGTOY
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x3

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PostPosted: Wed Feb 26, 2014 9:20 am Reply with quote
StretchASU
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3 votes for the master cylinder...I'll start there . Thanks guys.

With as much junk came out of the lines its not too far fetched to guess that all of that mess has torn up the seals inside the master as its gone through the system.

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PostPosted: Wed Feb 26, 2014 10:49 am Reply with quote
DAWGTOY
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don't forget to bench bleed that sucker.


Very Happy

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PostPosted: Wed Feb 26, 2014 7:43 pm Reply with quote
StretchASU
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Bench bled...helped a little but there is still air in the system. Got a bleeder on a rear drum that is stuck like crazy so I will mess with it when I get back next week. Never liked the solo bleeder method anyway. I'll con Robbie into coming over and helping me haha. Beer works for him.

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Re:
PostPosted: Thu Feb 27, 2014 9:06 am Reply with quote
Sleepy
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StretchASU wrote:
Bench bled...helped a little but there is still air in the system. Got a bleeder on a rear drum that is stuck like crazy so I will mess with it when I get back next week. Never liked the solo bleeder method anyway. I'll con Robbie into coming over and helping me haha. Beer works for him.


Let me know if you need help. You have my number!

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Re:
PostPosted: Thu Feb 27, 2014 9:11 am Reply with quote
StretchASU
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Sleepy wrote:
StretchASU wrote:
Bench bled...helped a little but there is still air in the system. Got a bleeder on a rear drum that is stuck like crazy so I will mess with it when I get back next week. Never liked the solo bleeder method anyway. I'll con Robbie into coming over and helping me haha. Beer works for him.


Let me know if you need help. You have my number!


I'll probably take you up on that Sleepy! I'm out of town a bunch next month for work so idk when it will happen, but I'll give ya a shout if I need a hand. This is all that is holding me up from putting a tag on it. I actually can't believe that the PO hauled his kid around in this thing with the brakes this bad. Rolling Eyes

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PostPosted: Thu Feb 27, 2014 9:13 am Reply with quote
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replace that bad bleeder. you can get one at napa/autozone.

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PostPosted: Thu Feb 27, 2014 9:48 am Reply with quote
StretchASU
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DAWGTOY wrote:
replace that bad bleeder. you can get one at napa/autozone.


Thats the plan. Getting it out...well I hope the days of soaking it in PB blaster helps Laughing

I had to clean junk out of the other 4. Lots of corrosion in those things. I will probably just do a full overhaul of the brakes for good measure given the amount of sh&%t that came out of this brake system. Peace of mind. I am sure the rest is neglected.

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PostPosted: Thu Feb 27, 2014 10:18 am Reply with quote
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For the small cost, I would go ahead and replace all 5 bleeders. Those things are bad about rounding off. Are those threads deep enough to run a tap in them to clean the threads?

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PostPosted: Thu Feb 27, 2014 12:27 pm Reply with quote
DAWGTOY
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if it breaks off or broken already just replace that slave cyl.
heck if you gonna do a full brake sys rebuild i'd replace em both.



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PostPosted: Thu Feb 27, 2014 1:22 pm Reply with quote
StretchASU
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Agreed. The wheel cylinders are about $14 a piece.

I put my digital calipers on the rotors last night and are not warped and mic out well within spec so I will get out of having to replace them.

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PostPosted: Thu Feb 27, 2014 1:24 pm Reply with quote
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sweet. turn em & burn em.

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PostPosted: Sat Mar 15, 2014 7:12 pm Reply with quote
92illpony
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i have the same issues with brakes. I've put 3 masters in. Booster replaced. just put in new shoes as the old ones were wore slap out and new brake cylinders. Brakes are 100 times better but still sink a good bit before working. They use to work great and one day went to hit the brakes and it hit the floor and ever since i've had crappy brakes.

I don't have a proportioning valve.
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Another stupid brake question
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