Both front calipers sticking?
#2652710
05/06/19 06:28 PM
05/06/19 06:28 PM
|
Joined: Jul 2007
Posts: 1,686 Philadelphia
radar
OP
top fuel
|
OP
top fuel
Joined: Jul 2007
Posts: 1,686
Philadelphia
|
Howdy
I think I got a handle on this but I dunno it’s always helpful to get another opinion. I haven’t gotten to the bottom of it and I already started throwing $ at the problem.
My bigblock 54 dodge pickup is sitting on a dakota front subframe. Brake wise everything is new from the banjo bolts up- hoses, lines, master. The donor truck had been sitting a year or so but was a runner and had decent looking pads loaded in with a lot of meat on them and the rotors/hubs had a little surface rust but freshly packed bearings with clean grease under the caps. So I didn’t have anything to lose by trying to run them.
Well now a year later I finally got the truck running and both front calipers are sticking applied after using them. I tried loosening the m/c from the booster to see if I had the booster pushrod adjusted out too far not letting the m/c piston return- no dice.
I went to a pepboys that said they had my calipers but when I got under the car I found they sold me two different wrong ones!
I threw new pads on the old calipers hoping that if the caliper pistons were worked in then out again they might free up. No luck there either but they did move in ok with not too much effort on a c clamp. I cracked a bleeder and it didn’t squirt like I would expect if it had a bunch of pressure trapped in there.
So I ordered a new set of calipers off rockauto but I have a nagging feeling it would have to be a bad master cylinder since both sides are doing it? It’s a corvette style master with a line for each front brake right off the master and an adjustable prop valve in the rear line so no factory prop valve to go bad. I don’t mind having new calipers to install but both calipers sticking is fishy.
Any ideas or comments? Thanks! Radar
Last edited by radar; 05/06/19 06:30 PM.
|
|
|
Re: Both front calipers sticking?
[Re: radar]
#2652720
05/06/19 07:08 PM
05/06/19 07:08 PM
|
Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
|
About to go away
Joined: Sep 2007
Posts: 14,889
up yours
|
having done all the typical isolating moves (loosening M/C, cracking bleeders) to verify it's not a hydraulic pressure issue I doubt it is the M/C. Though I was never a fan of those generic fits all booster setups based on the vette M/C. They tend to be problematic but usually the problem is not enough brakes, not brakes all the time. Did you clean and lube the rails the calipers ride on? Are there any worn spots in the guide ways that could be hanging them up? there was a thread on that the other day, with pics. Found itIt could be rust in the bores of the calipers not letting the pistons come back any, I suppose you could look at that.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
|
|
|
Re: Both front calipers sticking?
[Re: radar]
#2652733
05/06/19 07:46 PM
05/06/19 07:46 PM
|
Joined: Jan 2003
Posts: 12,801 Benton, IL.
DaveRS23
Master of nothing...
|
Master of nothing...
Joined: Jan 2003
Posts: 12,801
Benton, IL.
|
I have seen a lot of sticking calipers on the Dakotas. Just changed a pair out last month. Because they are such a problem, I usually get them from a salvage yard after looking at them and determining they are not OE. Those things are expensive and RA shipping is outrageous and then you have the core charges and return shipping.
A quick check to see if it is the caliper or the hose or master is to crack the bleeder. If it is the caliper, it won't help. The brake will still be tight. But if it is the hose or master, then the brake should release. If it seems to be the hose or master, press the brake pedal a few times to get the brake to stick and then you can then go to the brake line off the master and do the same thing to determine if it is the hose or master.
Master, again and still
|
|
|
Re: Both front calipers sticking?
[Re: DaveRS23]
#2652764
05/06/19 09:25 PM
05/06/19 09:25 PM
|
Joined: Jan 2003
Posts: 21,122 Niles , Ohio
therocks
oh wait.but hey.lets see.oh yeah.
|
oh wait.but hey.lets see.oh yeah.
Joined: Jan 2003
Posts: 21,122
Niles , Ohio
|
I agree with Dave on sticking calipars.My 99 Durango had no problems.I did frt pads and rotors at work.Drove off all perfect.ASfter about 15 miles one locked and smoking.Back top work replace the left as right was fine.New pads and rotor on that side.Left again and after about the same mileage same thing.Cussed myself out as I should have replaced both like I always do but was short on time.After all new drove it for 2 years and my son ghad it for 4.Still going great as his friend bought it.Rocky
Chrysler Firepower
|
|
|
Re: Both front calipers sticking?
[Re: radar]
#2652770
05/06/19 09:54 PM
05/06/19 09:54 PM
|
Joined: Feb 2003
Posts: 16,186 Mesa, Arizona
dart4forte
I Live Here
|
I Live Here
Joined: Feb 2003
Posts: 16,186
Mesa, Arizona
|
Solved my caliper problem. The rubber brake lines were collapsing. Under pressure when the brakes applied then collapsed when the peddle is released. The caliper stayed under pressure until the brake was applied again. I was told that some caliper pistons are made of a ceramic material.
“So if it’s on the internet it must be true”
Abe Lincoln
|
|
|
Re: Both front calipers sticking?
[Re: dart4forte]
#2652866
05/07/19 08:46 AM
05/07/19 08:46 AM
|
Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
|
About to go away
Joined: Sep 2007
Posts: 14,889
up yours
|
He's already stated in the very first post that he both loosened the master cylinder from the booster to make sure it's not a push rod length issue and that he's done the crack the bleeder test to verify no hydraulic pressure remains.
This pretty much eliminates the hoses, the master cylinder, the pushrod, the booster, the lines, the combination valve, the hoses, etc.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
|
|
|
Re: Both front calipers sticking?
[Re: radar]
#2653656
05/09/19 11:01 AM
05/09/19 11:01 AM
|
Joined: Sep 2003
Posts: 20,235 north of coder
moparx
"Butt Crack Bob"
|
"Butt Crack Bob"
Joined: Sep 2003
Posts: 20,235
north of coder
|
i may be full of sh.. , er, malarkey, [probably more the former than the latter] but i believe the GM masters use the front bowl for the front brakes, and the rear bowl for the rears. that is exactly opposite from the way ma mopar plumbs ours, so there "may" be one of those rubber things behind the tube seat in the rear port, allowing 10lbs or so residual pressure to remain, which wouldn't be much of a spurt cracking the bleeder. i ran into this once before using a GM based kit, so ?? just something you may want to check out, i suppose.
|
|
|
Re: Both front calipers sticking?
[Re: moparx]
#2653693
05/09/19 12:59 PM
05/09/19 12:59 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
stick a drill bit into the brass cones & if it has the RPV you will feel it as it is just a piece of neoprene and a spring then pull the brass cone (the hard part) to R&R it.
live every 24 hour block of time like it's your last day on earth
|
|
|
|
|