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Old 01-24-2019, 08:14 AM
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Hard to turn only while breaking

I have had an issue with a 87 1/2 ton 4x4 squarebody solid front axle truck since I bought it.

The thing is hard to turn when I hit the brakes. Like binding hard.

The thing drives straight as an arrow and tires are wearing even. Can let go and accelerate, coast, break light or hard and still straight as an arrow.

Can turn in circles, doughnuts, whatever no problem with front hubs locked or unlocked it makes no diffrence.

Thing is pre abs and does not have any rod on the rear axle to adjust proportion.

Non hydroboost it is vacume brakes.

Only happens when breaking. The suspension and bushings are worn. But the thing drives straight so i left it alone for now.

It is more a nuisance then anything. But would like to fix it if something simple.

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Old 01-25-2019, 06:00 AM
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Originally Posted by cerial View Post

Only happens when breaking. The suspension and bushings are worn. But the thing drives straight so i left it alone for now.

It is more a nuisance then anything. But would like to fix it if something simple.
How much suspension movement when you brake?
Any marks on the tie rods or any part of the steering?
I'm thinking the worn suspension is putting something in a bind.
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Old 01-25-2019, 08:03 AM
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Check for bad steering knuckle(s).

Last edited by '48 Austin; 01-25-2019 at 08:09 AM.
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Old 01-25-2019, 08:44 AM
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Quote:
Originally Posted by Bob37pont View Post
How much suspension movement when you brake?
Any marks on the tie rods or any part of the steering?
I'm thinking the worn suspension is putting something in a bind.

That would be my guess also.
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Old 01-25-2019, 10:37 PM
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Originally Posted by Bob37pont View Post
How much suspension movement when you brake?
Any marks on the tie rods or any part of the steering?
I'm thinking the worn suspension is putting something in a bind.
Next to none I am very light on my brakes. Even when i mash it there is not any diving. Have the factory shocks with the coils around the shock. Things still work pretty good.
No fresh marks on the tie rods but the thing is 32 years old. It was neglected for 31 of those so everything is untouched. It is s 3 year weekend project that i am 10 months in. Mileage is a confirmed 105k with me basically finding nothing but oem parts as i replsce them. Thing was used as a plow truck so things sat. Thing had a transmission pan and shifter leak and the guy just kept pouring new fluid in toping it off before using it. Thing does shift like new so guess him being lazy paid off for me.

I replaced the brakes, fuel system, cooling system, rear u joints, most of the electronics, built a flatbed, put some paint on the thing to just make it safe for the winter last year.

I did new hubs and spindle bearings but did not do the u joints yet so the knuckles are possible.

Could be suspension also. 2019 is body and engine.

Will do the front u joints also doing the rubber at the same time.

Basically everything is getting replaced or modified over 3 years. Entire drivetrain and suspension being pulled and upgraded that 3rd year so only doing enough with the current stuff to drive it reliably 5-7k a year.

Will tear into that front axle in the spring doing those spindles and rubber. Thank you for the help.
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Old 01-26-2019, 03:14 PM
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Power steering pump pressure falling off coinciding with the rpm drop when you brake and turn.
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Old 01-28-2019, 11:29 PM
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that seems like a natural! i was thinking the loss of vacuum, but that makes sense too. maybe a smaller pulley on the ps pump? would that fix it if that's an rpm thing?
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Old 01-29-2019, 09:55 PM
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Originally Posted by johnsongrass1 View Post
Power steering pump pressure falling off coinciding with the rpm drop when you brake and turn.
Could very well be. Thing is stock and truck was used as a plow truck. The thing does not whine when turning in park but maybe something internal is going on in the pump or box.

I put 5k on the truck over 9 months just driving around town. Dragging my feet on replacing the accessories because I want to replace the 87 5.7 engine with the dual belt setup with a 88-93 serpentine setup engine here in the summer.

Everything is getting replaced or modified over 3 years. But after several years of saving I am looking forward to get out of the "communities" and into a place where i can dismantle cars once again. Truck only gets what it absolutely needs to be reliable till i can have one or two to get parts from.
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