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(NEW) Front brake calpers dragging.. . . BAD!!!


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ratrace2
User

Dec 13, 2009, 3:02 PM

Post #1 of 22 (2716 views)
(NEW) Front brake calpers dragging.. . . BAD!!! Sign In

Hello All:

Well, my 1998 Chevy S-10 (2wd) 2.2L MFI is really sucking.

Last week, I sprang a leak in my (Rear) brake line--rusted plum through (cheap Chinese steel). Well, the pedal went to the floor and I only had front brakes.

So, I had some time on my hands and went to work.

I Replaced:

(a)Front calipers
(b) Master Cylinder (NEW)
(c) brake line--the broken one
(d) rear brake wheel cylinders
(e) rear brake pads--and front
(f) rear brake hose

Just ordered Front Brake Hoses.......


Here is the story: I did all of the above and all of a sudden the front calipers are locking up on the truck. Holly COW! in a couple 3/5 miles
the rotors really get hot. Funny thing. When I start out with the car cold they seem OK, don't drag but a couple of pumps of the brake pedel and they start to drag........

DARN...........................I need a clue?

Question: should I check the throw (stroke length) of the power booster?


Hammer Time
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Dec 13, 2009, 3:15 PM

Post #2 of 22 (2707 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

The next time they lock up, loosen the bolts at the master and see if they release.

I believe your push rod at the master is out of adjustment and the master is not returning all the way back which will cause the system to build up pressure and hold it. You need to have about 1/4" of free play in the top of the brake pedal before it contacts the master cylinder.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Dec 13, 2009, 3:15 PM)


ratrace2
User

Dec 13, 2009, 3:45 PM

Post #3 of 22 (2702 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

Hammer is on the job. . . I feel better now!

Yea, I was noticing that the pedal would loose all of it's play and start hard from the very top of the stroke. it, the pedal, would loose all of it's free play.

OK, tomorrow I'll pull the master off and check for the adjustment at the Power Booster and see if I can back it off a bit.

Also, I was thinking about shimming the master out with a couple of washers if I couldn't get the adjustment on the power booster, the other way.

Could you give me the 1,2,3, of how to adjust that stroke at the power booster????? Please.



Thanks, much hammertime... . . . .


(This post was edited by ratrace2 on Dec 13, 2009, 3:54 PM)


Hammer Time
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Dec 13, 2009, 4:10 PM

Post #4 of 22 (2695 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

The pushrod going into the master should be adjustable. If it's not, then you may have the wrong master. Do not try shimming it. You will lose all the strength and get a spongy pedal if you do that.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ratrace2
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Dec 13, 2009, 5:36 PM

Post #5 of 22 (2687 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

So, how you go about adjusting the power boster throw?????
There is no adjustment on the master cylinder itself.
It has to be with the power boster, any special tools????

Mybe I should get a subscription to AllData.com (tech manual) ever use them????
What is the best tech manual for Chevy????


(This post was edited by ratrace2 on Dec 13, 2009, 5:37 PM)


Hammer Time
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Dec 13, 2009, 5:48 PM

Post #6 of 22 (2677 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

Alldata says that if you don't have an adjustable rod that you can purchase one, likely only at the dealer, that is adjustable.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ratrace2
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Dec 13, 2009, 6:04 PM

Post #7 of 22 (2673 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

What a nightmare of a brake job. I have been working on Chevy's for 30 years. I have never seen a brake job go like this one.

Hammer. . . . .you are the man, buddy.. . .Thanks so much. . . . .I'll get on that power booster adjustment tomorrow.

I'm still going to change the front brake hoses though; 2 for $22.00, what the heck.


Hammer Time
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Dec 13, 2009, 6:18 PM

Post #8 of 22 (2670 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

If your going to use $22 brake pads, your better off leaving the old ones. Your just asking for more noises and problems with junk pads like that. A good set of pads is going to cost you $40 or better. Cheap pards are made with way too much metal and none of the things that make them run quiet.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ratrace2
User

Dec 13, 2009, 6:26 PM

Post #9 of 22 (2667 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

I'm sorry, front brake LINE HOSES. . .. .. . .both are about $22.00 at autozone.
They should be there tomorrow around 10:00am. . .. .got to go to work at 1:00pm.......


Hammer Time
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Dec 13, 2009, 6:30 PM

Post #10 of 22 (2663 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

OH, that's cool then........



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ratrace2
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Dec 13, 2009, 7:13 PM

Post #11 of 22 (2658 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

Does AllData tell you how far the master cylinder should travel?????

If I knew this then it would be easy.


Hammer Time
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Dec 13, 2009, 7:19 PM

Post #12 of 22 (2656 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

That's not what you need to know. You just need to make sure there is 1/4" of free travel before it hits the master. It's making sure it retracts all the way is what your looking for.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ratrace2
User

Dec 13, 2009, 7:34 PM

Post #13 of 22 (2652 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

Got it. . . . .


retracts all the way.

1/4 free play. . . ..


thanks so much. . . . .


Hammer Time
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Dec 13, 2009, 7:50 PM

Post #14 of 22 (2647 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

That was 1/4" at the pedal. That equates to 1/16" or less at the rod. Just enough to be sure the rod is coming away from the master.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ratrace2
User

Dec 13, 2009, 7:52 PM

Post #15 of 22 (2642 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

got'ya 1/16 free play at the rod... . . . . . .


ratrace2
User

Dec 14, 2009, 7:38 PM

Post #16 of 22 (2632 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

The Brakes are working fine, thank you very much Hammer.

Good news and bad news.

First, you were right, the power booster wasn't letting the master dump.
Second, I know you said not to but I had to get to work and I couldn't find a way
to adjust the rod on the booster so I just put two 1/16th shim washers between the master and
the master cyl.. . . .works great. Pedal is firm, brakes don't bind and drag, No more smoking rotors.


Hammer Time
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Dec 14, 2009, 7:45 PM

Post #17 of 22 (2629 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In


Quote
works great. Pedal is firm, brakes don't bind and drag, No more smoking rotors.


Yeah, it will......... right up to the point where the studs break off from flexing and pedal pressure and you run over somebody.

There's one golden rule in this business

If you can't stop............ don't go!



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ratrace2
User

Dec 14, 2009, 8:31 PM

Post #18 of 22 (2625 views)
Re: (NEW) Front brake calpers dragging.. . . BAD!!! Sign In

Alright already, I'll go find one of those adjustable Rod "thingys" tomorrow.. . . . . .

NO roadkill for me. . . . .


Tom Greenleaf
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Dec 16, 2009, 8:55 AM

Post #19 of 22 (2616 views)
Re: (NEW) Front brake calipers dragging.. . . BAD!!! Sign In

I say HT hit it with the clearance of the push rod and the centering/receiving hole of master. It happened to me just once and after plenty of hair loss it was a fault traced to one factory of not making it to spec. Heat - even engine heat would apply the brakes pretty dang hard!

Told the lady not to drive it and I went and figured since it was fine cold that I'd just come get it and I drove it back to shop using just parking brake. It lasted longer but did it me not so bad though. Even engine heat warms brake lines - fluid expanded fooling it and fluid doesn't return as it should.

Rare but stuff happens. Still good to do brake hoses but if both wheels I can't see both failing at once. That was a 92 Caddy - remember it like yesterday,

T



ratrace2
User

Dec 30, 2009, 8:30 PM

Post #20 of 22 (2587 views)
Re: (NEW) Front brake calipers dragging.. . . BAD!!! Sign In

Well, my shims are still working fine. . . . . . .

I talked to a couple of mechanics around town and they said that they--on a corvette--had to do the same thing.. . .

. . . .works fine.


Tom Greenleaf
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Dec 31, 2009, 9:52 AM

Post #21 of 22 (2584 views)
Re: (NEW) Front brake calipers dragging.. . . BAD!!! Sign In

I don't prefer shimming it further away as the part should be right. If you could get a perfect shim covering entire area where it touched booster I might go for that. My opinion - others may disagree,

T



Loren Champlain Sr
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Dec 31, 2009, 5:40 PM

Post #22 of 22 (2577 views)
Re: (NEW) Front brake calipers dragging.. . . BAD!!! Sign In

PMJIH; If you must 'shim' it, something is WRONG. If you must use an adjustable push-rod, something is WRONG. You don't mess around with brakes. Could be an incorrect master cylinder (incorrect application, part number incorrect, boxed wrong, ect., ect., ect.) Could be a brake hose or hoses collapsing internally not allowing the pressure to return. Could be incorrect fluid (petroleum product vs. DOT 3 brake fluid). Could be overfilled reservoir (fluid will expand with heat)... This is not something that you want to guess at. Hopefully, you still have the old master cylinder. Inspect the rear of the piston area. Is the new one bored the same depth as the original one? Something is wrong, here, and can't be 'overlooked'. As HT said, if it don't stop, don't drive it. To add; You don't 'Mickey Mouse' brakes. JMO. We'll be more than happy to help you through this. It's just tough without being there.
Loren
SW Washington






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