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OT- Farm truck brake problem

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Richard G.

04-14-2007 14:31:04

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My son has a 71 International 1600 grain truck with a 345 V8 and less than 100,000 miles on it. The brakes started acting up on it last year.
You push the peddle to stop and the pedal would get very hard to push and then push back against your foot.
He replaced the vacuum booster and bled the lines and it still did the same thing. He put on a new master cylinder and a second new booster and still did the same thing.
Now, he just put on a third booster, a new check valve in the vacuum line, adjusted the brakes, bled the lines and tried it again today.
It has normal brakes sometimes, the pedal gets hard sometimes and other times the pedal goes to the floor. I am about to pull out what little hair I have left trying to figure this out.
Any help would be appreciated.
Richard

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big jt

04-15-2007 07:45:40

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Re: OT- Farm truck brake problem in reply to Richard G., 04-14-2007 14:31:04

I agree with Traper

Does your truck have a brake vacuum guage. If not that may be the rout you need to pursue.

both of our grain trucks have them from the factory.

Just sounds like you are losing vacuum.

Might want to plumb in a guage on the booster side of the check valve.

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Bob

04-14-2007 23:55:58

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Re: OT- Farm truck brake problem in reply to Richard G., 04-14-2007 14:31:04

The piston travel of the vacuum brake booster displaces a certain amount of brake fluid as it moves through a full stroke, and if ALL the brake shoes are not set up "tight" enough, the booster reaches the end of it's stroke before the brakes are firmly applied, and, GUESS WHAT... hard pedal, maybe even "kickback" and a scary ride.

Set up ALL the brake adjustments properly, and see if that helps.

Also, check the "breather" or "filter" for the hydrovac and ALL rubber hoses. If a hose collapses under vacuum, or the breather filter is clogged, the system will act WEIRD.

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Leland

04-14-2007 20:38:01

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Re: OT- Farm truck brake problem in reply to Richard G., 04-14-2007 14:31:04

a lot of those old loadstars I drove had wonder brakes

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traper

04-14-2007 19:15:53

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Re: OT- Farm truck brake problem in reply to Richard G., 04-14-2007 14:31:04

Richard//Lets take this in another direction dose your engine sound smooth on exhaust at idle?If not check for rotted steel line engine to boster or other major vaccum leaks.I had this problem on my 1973 1600 load star gas.

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Jim WJ

04-14-2007 19:15:30

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Re: OT- Farm truck brake problem in reply to Richard G., 04-14-2007 14:31:04

With all the components that you have replaced and if the shoes are properly adjusted Keep bleeding. I worked several years for an IH dealer and it was routine to bleed a Quart through each wheel. It may sound like alot of fluid but we always got a hard pedal. [ also bleed at the hydro-vac ] Hope this will help Jim WJ

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rrlund

04-14-2007 18:22:11

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Re: OT- Farm truck brake problem in reply to Richard G., 04-14-2007 14:31:04

Probably been answered below,but I had a '72 Chevy C50 milk truck that liked to do that when the brakes were out of adjustment. I rearended an old guy in a pickup,loaded,one day when he stopped quick in front of me for a school bus. Never did have to replace the booster,just took it to the Chevy garage now and then and had them adjusted.

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frankiee

04-14-2007 15:28:31

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Re: OT- Farm truck brake problem in reply to Richard G., 04-14-2007 14:31:04

I had a Chevelle with 4 drums on it for brakes when I was 16. The brakes acted as you described when I taxed the brakes with excessive speed and going down Kimberly Mountain at 100mph.
Are your brakes getting hot? Have you got a heat gun to put on the area of the drums just after it happens? As I understand what happened to my Chevelle years ago was that the shoes got vapor between the drum and shoe and that took the brakeing force away. Then the harder I pushed, the brake fluid would vaporize in the lines and push back on the pedel lifting my leg.
Could be wrong there as to what happened but that is what I gathered through the years.
I think you may have a heat issue with the brakes.
I notice that the flex lines were not changed.
They can go internally and act as an unwanted valve and have the brakes drag creating heat.
Also, are all the brakes working? Front and rear.
Having all brakeing done on one axle would also make heat.
If its anything like my Chevelle was, it has to be found. Not fun when brakes are needed most and the brakes push back.

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1206SWMO

04-14-2007 14:45:23

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Re: OT- Farm truck brake problem in reply to Richard G., 04-14-2007 14:31:04

I have a 1968 1800 IH and a 1969 1600 IH Loadstars.They are both great trucks except for the brakes.I have fought them both since I got them.The brakes are near impossible to bleed.Several friends that are good mechanics have given up on them.

I have a complete new brake system on the 1800 and have a hard pedal no matter what we do.Its even been power bled.

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shannon from ohio

04-14-2007 14:36:18

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Re: OT- Farm truck brake problem in reply to Richard G., 04-14-2007 14:31:04

...Defective proportioning valve...

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bob ia

04-14-2007 18:46:13

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Re: OT- Farm truck brake problem in reply to shannon from ohio, 04-14-2007 14:36:18

I have a 82 chev and I had a brake line get plugged and had same problem. found it when bleeding them

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Big un

04-14-2007 14:54:50

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Re: OT- Farm truck brake problem in reply to shannon from ohio, 04-14-2007 14:36:18

I agree with Shannon.We had 68 model and spent hundreds of dollars on it before we replaced the valve on the frame.That fixed the brakes.It had rusted up inside and would sometimes let fluid thru and then stop completely up and cut the fluid off again. A real pain.

Bigun

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Richard G.

04-15-2007 18:28:55

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Re: OT- Farm truck brake problem in reply to Big un, 04-14-2007 14:54:50

Thanks for all the ideas.
My son removed what he thought was the proportioning valve today on the frame. It is nothing but a tee fitting. Any more ideas.
I plan to start working on it tommorow if the wind drops below 40 MPH here in NW SC.
Richard

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