Braking Problem
#3157323
07/05/23 07:40 PM
07/05/23 07:40 PM
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Joined: Dec 2015
Posts: 71 Mid-Michigan
abodybill
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OP
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Posts: 71
Mid-Michigan
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The braking problem is on my 1985 D250 with power brakes.
When first stopping the truck after it sit's all night they like to throw you into the windshield or like they lock up and this only happens the firs 3-5 times using the brakes and then all is normal till the truck sit's say over night.
I did replace the front brake hoses but no change.
So need some ideas on what to check on.
Thanks for any help Bill
1969 Road Runner 1985 D250 pickup
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Re: Braking Problem
[Re: abodybill]
#3157333
07/05/23 08:37 PM
07/05/23 08:37 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Just a guess, might be an internal booster problem. not sure if this is a correct diagnostic procedure but I would clamp the booster hose & see how it acts. Keep us posted!
live every 24 hour block of time like it's your last day on earth
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Re: Braking Problem
[Re: iapco103]
#3157507
07/06/23 12:19 PM
07/06/23 12:19 PM
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Joined: Jan 2003
Posts: 12,043 State of Confusion
hp383
Just a normal tag again
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Just a normal tag again
Joined: Jan 2003
Posts: 12,043
State of Confusion
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My 88 Ramcharger also does this. Its usually just the first time, or two, that the brakes are hyper touchy, then good.
Its done it on two different sets of calipers, rotors, and master/booster setups, so I have no idea. I just live with it for now. I can never duplicate it for a mechanic, everything has been inspected and seems to be working within parameters.
Join the Penguin Liberation Front!! Stop the Hippo Occupation!
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Re: Braking Problem
[Re: hp383]
#3157639
07/06/23 06:03 PM
07/06/23 06:03 PM
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Joined: Dec 2015
Posts: 71 Mid-Michigan
abodybill
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My 88 Ramcharger also does this. Its usually just the first time, or two, that the brakes are hyper touchy, then good.
Its done it on two different sets of calipers, rotors, and master/booster setups, so I have no idea. I just live with it for now. I can never duplicate it for a mechanic, everything has been inspected and seems to be working within parameters. Fits my problem to a T and I also went thru what you did and been living with this also.
Last edited by abodybill; 07/06/23 06:04 PM.
1969 Road Runner 1985 D250 pickup
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Re: Braking Problem
[Re: abodybill]
#3157696
07/06/23 09:55 PM
07/06/23 09:55 PM
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Joined: Jan 2003
Posts: 15,355 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,355
Omaha Ne
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Might want to try putting gauges on the calipers to see what the pressures are doing after it sits overnight. It either has to be pressure of pad related. Might then talk to the pad supplier. I would advise having the pressure data before doing so. Another option would be to have set of pads done by an independent re-liner keep us posted. BTW I LOVE solving problems like this
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Re: Braking Problem
[Re: abodybill]
#3158143
07/08/23 10:26 PM
07/08/23 10:26 PM
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Joined: Jan 2003
Posts: 21,507 N.E. OHIO, USA
A12
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 21,507
N.E. OHIO, USA
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My 88 Ramcharger also does this. Its usually just the first time, or two, that the brakes are hyper touchy, then good.
Its done it on two different sets of calipers, rotors, and master/booster setups, so I have no idea. I just live with it for now. I can never duplicate it for a mechanic, everything has been inspected and seems to be working within parameters. Fits my problem to a T and I also went thru what you did and been living with this also. This is from a Jeep forum and has to do with drum brakes: The OP wrote: Anybody else have this problem, when I start the Jeep up in the morning, the brakes are crazy sensitive, like I tap them and its like I slamming them on.. but once the car warms up or is driven a bit they are normal.. this normal, or something I should care about, its more of a nusiance when I almost knock my head off the steering wheel every morning when I stop for the first time.. Then further on he wrote this: It is caused by a thin film of rust inside the drum brakes. It is not just Jeeps that this happens to, but potentially any vehicle. I had a Lumina van that would lock up so hard that the ABS would kick in! After a mile or so, the rust is worn off and the brakes are back to normal.
And this after many challenged or question his diagnosis: yeah...seems crazy... But it is the coefficient of friction that changes. For example, if the coefficient of friction for your brake shoes is 2, that means that for every pound of force applied to each square inch of brake shoe, the effect of the friction will be 2 lbs of force against the "sliding" surface of the brake drum. With a thin film of rust, which can easily slip in between the drum and shoe, the cf may increase, let say to 10. Now when you gently feather the brake pedal and apply that same 1lb of force, there will be 10 pounds (instead of 2) of force at the "sliding" surface of the brake drum. Hence the extra braking power!! Don't shoot the messenger, just what I found on the internet so it must be true or so Now you'll come back and say your D250 has four wheel discs and I'll be and you can me
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Re: Braking Problem
[Re: TJP]
#3158256
07/09/23 01:11 PM
07/09/23 01:11 PM
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Joined: May 2019
Posts: 6,241 nowhere
Sniper
master
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master
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Posts: 6,241
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Likely surface rust that is scrubbed off after the first few stops. I would agree if it were sitting for longer periods but Overnight??? I suspect the local humidity levels might play a part. Michigan isn't exactly dry.
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Re: Braking Problem
[Re: Sniper]
#3158268
07/09/23 01:55 PM
07/09/23 01:55 PM
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Joined: Jan 2003
Posts: 21,507 N.E. OHIO, USA
A12
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 21,507
N.E. OHIO, USA
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Likely surface rust that is scrubbed off after the first few stops. I would agree if it were sitting for longer periods but Overnight??? I suspect the local humidity levels might play a part. Michigan isn't exactly dry. Michigan "The Great Lakes State" what makes you say that?
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Re: Braking Problem
[Re: dvw]
#3158273
07/09/23 02:07 PM
07/09/23 02:07 PM
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Joined: Dec 2015
Posts: 71 Mid-Michigan
abodybill
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Is it the front or rears locking up? As stated I've seen rear drum brakes exibit this issue. It was very common with Cavalier's when I worked at the Chevy dealer. We swapped rear shoes to aftermarket units . Problem solved. Doug Just the fronts
1969 Road Runner 1985 D250 pickup
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Re: Braking Problem
[Re: abodybill]
#3158367
07/09/23 09:41 PM
07/09/23 09:41 PM
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Joined: Jan 2003
Posts: 15,355 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,355
Omaha Ne
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Ironically I had a new 88 Pontiac grand prix that had the exact opposite issue. The brakes were totally ineffective for the 1st 3- 4 stops or miles. it was a time when they were playing with composite rotors and pad materials. I had it back to the dealer several times to document the condition. The same car ATE the front Pads and Rotors with only 14K miles on them. Normal driving and the only car I've owned that didn't go 40K + on the front brakes. I note others are posting similar issues. Can any of you see the rotor surface at all through the wheels?, If so, you could try a kwik wipe with a CLEAN white paper towel or kleenex to see if it is wet or rusty for those thinking rust or moisture? Or possibly to LIGHTLY ride the pedal for a 1/2 block or so? Another question: do they all do this year round? (Humidity would be lower in the winter I would think)
Last edited by TJP; 07/09/23 09:44 PM.
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