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Old 05-31-2015, 10:05 PM   #1
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Rear brakes

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Looking for a little help. I have a 86 chieftain that actually has two issues, one is that the rear brakes wants to seize up , kinda feels like the emergency brakes are the cause. You can feel them grabbing as you drive. Had the front redone. Just wondering if there could be something else that's causing this. The other is lost of acceleration, but you can put it neutral an the motor will rev up no problem. Any suggestions ?

Thanks
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Old 05-31-2015, 11:53 PM   #2
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Welcome to irv2.

Knowing what chassis and engine combination you have would help members with ideas to help your problems.
Rear brake drag due to seized wheel cylinders or leaking rear axle seals, could be holding you back and giving poor throttle response.
But there is also the possibility, that you have a plugged fuel filter or other problems. If take less fuel to rev the engine in neutral than under load.

Do you have service records on the coach ?
Last tune up or fuel filter change?
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Old 06-01-2015, 12:15 AM   #3
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I'm guessing you have rear drums. Not knowing the history of vehicle, I would remove the drums and rebuild the rear brake system. Sounds like you have sticky wheel cylinders and while in there I would change out the brake shoe springs to know you at least have good clean parts and not worn, weak, rusty components. Then drain and replace the brake fluid with new to eliminate any old water contaminated brake fluid. Also look to see if rear axle seals are intact and not leaking or any work on brakes will go for naught after awhile.

Of course looking over the brake shoes to determine their condition to reuse or replace. They only cost around $40 for both sides.

Now would be good time to determine if brake drums need turning to get rid of any heavy ridges. If they look OK then reuse---as long as they're within specs of still usable(whether turned or not)


After brake issues are taken care of, then see if your engine drag is eliminated.
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Old 06-01-2015, 06:59 AM   #4
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If it's a GM chassis it seems to me the is an issue with the rubber lines that go to the calipers. something about holding pressure after letting off of the brakes. Someone else may chime in with some better information.
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Old 06-01-2015, 08:01 AM   #5
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As mentioned earlier, you need to identify the chassis & engine.

If you have a GM chassis, there is a "hidden" fuel filter halfway between the gas tank and engine, tucked up by the passenger side frame rail. When this becomes clogged, it can affect engine performance under load.

Quote:
Originally Posted by Kngcobra View Post
New to forum

Looking for a little help. I have a 86 chieftain that actually has two issues, one is that the rear brakes wants to seize up , kinda feels like the emergency brakes are the cause. You can feel them grabbing as you drive. Had the front redone. Just wondering if there could be something else that's causing this. The other is lost of acceleration, but you can put it neutral an the motor will rev up no problem. Any suggestions ?

Thanks
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Old 06-01-2015, 06:28 PM   #6
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Rear brakes

Quote:
Originally Posted by Skip426 View Post
Welcome to irv2.

Knowing what chassis and engine combination you have would help members with ideas to help your problems.
Rear brake drag due to seized wheel cylinders or leaking rear axle seals, could be holding you back and giving poor throttle response.
But there is also the possibility, that you have a plugged fuel filter or other problems. If take less fuel to rev the engine in neutral than under load.

Do you have service records on the coach ?
Last tune up or fuel filter change?
Lol , that would help, 454cid ,a p30 chassis , I know ,I've read people saying there such thing that it's a p32, one says no it's a p30, don't want to get into that. But yes it has drum brakes. Didn't know that a leaking rear axle would cause this issue though, learn something new everyday. Don't see any signs of leaking either. Had a tune up done less than 1500 mile ago. I have changed the fuel filter in the carb twice. Motor has 88000 miles, still runs good. I thought maybe there was a inline fuel filter so I thought I bought one (so the part store says) for p30 rv chassis. Found what I thought was it but turns out to be an inline electric fuel pump. I have only ran maybe four tanks of gas out since tune up. Will do the rear drum brakes. Hope this helps both issues. Thanks Skip you've been a big help.
Brian
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Old 06-01-2015, 06:35 PM   #7
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Rear brakes

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Originally Posted by JaycoEagle10 View Post
I'm guessing you have rear drums. Not knowing the history of vehicle, I would remove the drums and rebuild the rear brake system. Sounds like you have sticky wheel cylinders and while in there I would change out the brake shoe springs to know you at least have good clean parts and not worn, weak, rusty components. Then drain and replace the brake fluid with new to eliminate any old water contaminated brake fluid. Also look to see if rear axle seals are intact and not leaking or any work on brakes will go for naught after awhile.

Of course looking over the brake shoes to determine their condition to reuse or replace. They only cost around $40 for both sides.

Now would be good time to determine if brake drums need turning to get rid of any heavy ridges. If they look OK then reuse---as long as they're within specs of still usable(whether turned or not)


After brake issues are taken care of, then see if your engine drag is eliminated.
Thanks jaycoeagle, I only bought this bout 6 months ago, pretty decent shape, it is old though. I didn't know that the rear axle could cause rear brakes to drag though. I will redo rear brakes ( just redone front , calipers an all ) hope this will solve the acceleration issues as well.
Thanks again
Brian
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Old 06-01-2015, 06:42 PM   #8
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Quote:
Originally Posted by George Schweikle View Post
As mentioned earlier, you need to identify the chassis & engine.

If you have a GM chassis, there is a "hidden" fuel filter halfway between the gas tank and engine, tucked up by the passenger side frame rail. When this becomes clogged, it can affect engine performance under load.
It is a p30 chassis with a 454cid. I have located what I thought was a fuel filter on the side you mentioned , but it is a inline electric fuel pump, looks like a regular fuel filter same size , but it's a fuel pump. ( ? ). I'm guessing for the generator .

Brian
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Old 06-01-2015, 09:02 PM   #9
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Quote:
Originally Posted by Kngcobra View Post
Thanks jaycoeagle, I didn't know that the rear axle could cause rear brakes to drag though. I will redo rear brakes ( just redone front , calipers an all ) hope this will solve the acceleration issues as well.
Thanks again
Brian
EDITED:

Well, a rear axle seal WON'T cause rear brakes to drag.

What it will do if leaking, cause what brake work is done and not fixed, is (if) bad enough, can put gear lube all over the brake shoes, which will absorb it and cause them to fail and I've seen it also absorbed into the drums from the braking heat where the drums also had to be replaced.

Bad part is if seals are leaking, you need to remove the axle(s) to replace the seal(s)---not fun work, but I guess on the bright side, you replace the old rear differential lube. Hope it doesn't come to it though.
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Old 06-02-2015, 09:16 AM   #10
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Just perform standard brake job and inspect everything.

Check park brake system as well.
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Old 06-05-2015, 09:30 PM   #11
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Quote:
Originally Posted by Kngcobra View Post
Lol , that would help, 454cid ,a p30 chassis , I know ,I've read people saying there such thing that it's a p32, one says no it's a p30, don't want to get into that. ...
Brian
But just for fun, lets clear that up. While technically there is no such thing as a P30, P30 is the genaric term for anything in the P3x series chassis. Some will try to differentiate between that and a P32, but GM never made a P3"0" chassis. The term is generic and covers several chassis starting with the P3..., so its OK to use.

As far as questioning your brakes, if they are dragging they will heat up. Drive a few down the road and coast to a stop (down shift and then just brake at the very end) see if either brake gets hot. If it does, then you know your answer.

BTW: On the 4brrl the secondaries only open by vacuum, and not till the peddle is ~2/3rds throttle. When I bought my coach, the linkage was misadjusted so the secondaries on the 4brrl would not open. Fixed that and the engine sure changed its tune. (that was w/original engine)
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Old 06-06-2015, 09:07 AM   #12
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Thanks Dave
I think I'm gonna redo both sides , don't think they have ever been replaced. Got the front redone. The carb seems to open up the back but doesn't seem to drop down when floored. Motor does run pretty good other wish, no oil usage. It's old just needs a lot of small things that will and can add up in cost. I just have to decide how far I wants go with it. Maybe u have a suggestion for this, there is a lot of heat coming from under the dash , I need to find a way to stop this. ?
Thanks
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Old 06-06-2015, 09:25 AM   #13
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Although not common, old rubber/flexible hydraulic brake hoses can deteriorate internally and cause the brake they serve to drag, (not fully release).
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Old 06-06-2015, 12:33 PM   #14
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If I remember correctly, in order to remove the drums on those, you have to remove the axle shafts and take the spindle nuts off to slide the whole drum/hub assembly off, so you will have to replace the axle seals anyways. It is a good idea to change the rubber hoses on the brake system anyways on that old a unit, they are not expensive. I agree with the replacing the brake fluid also, Should be changed every 5 or 6 years anyways, it draws moisture and then you don't have effective braking anymore.
Frank
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