Truck pulls to right when on the brakes....ideas on why? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 9 (permalink) Old 04-12-2019, 10:17 PM Thread Starter
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Exclamation Truck pulls to right when on the brakes....ideas on why?

Ever since I got my 05' F250 a few years ago, I've noticed that it pulls to the right pretty good when I get on the brakes hard. I finally got tired of it, and dug into the problem last weekend. The pads were shot, and so were the rotors.....so I replaced everything. The caliper pins all slid back and forth easily, but I re-greased them anyway. I cleaned the groves that the pads sat in, and installed new retaining clips. Just for the heck of it, I also bled the lines and topped everything off with fresh fluid. I put it all back together.......and I think it's doing it worse than is was before.

I have to counter steer pretty hard to keep the truck going straight when I get on the brakes. As soon as I let off the brake, the truck goes straight again.

At this point, the only thing I can think of would be that the left (drivers side) caliper is sticking, and not squeezing as hard as the right side....causing the truck to pull right. OR...maybe the front brake like on the left said is expanding more than the right side....causing more pressure to go to the right side...pulling the truck right?

Any way to test stuff out before I just start replacing parts? Anything else it could be?

The truck has 225,000 miles on it...and as far as I know, original calipers and lines.

Thanks for the help!

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post #2 of 9 (permalink) Old 04-12-2019, 10:36 PM
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Re: Truck pulls to right when on the brakes....ideas on why?

at 225k miles, i would replace both front soft lines just because.
but it does sound to me like you either have a failing left soft line, or a failing caliper.

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post #3 of 9 (permalink) Old 04-12-2019, 11:00 PM
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Re: Truck pulls to right when on the brakes....ideas on why?

I would say failing drivers caliper. But it's best to replace them in pairs.

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post #4 of 9 (permalink) Old 04-13-2019, 10:08 AM
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Re: Truck pulls to right when on the brakes....ideas on why?

Calipers, lines, tire pressure.

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post #5 of 9 (permalink) Old 04-13-2019, 09:47 PM Thread Starter
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Re: Truck pulls to right when on the brakes....ideas on why?

Thanks for all the great info! I did a little testing with the temp gun today. Before I did, I made sure to check the tire pressure.......and there were all within 1-2 psi of each other.

I went for a drive on a straight section of farm road at around 60mph. I got on the brakes pretty hard 3 times to heat them up, and then found a place to pull over to take some temp readings. The rear rotors were within 10 degrees of each other. But the front driver side rotor was about 50 degrees cooler than the passenger side...that would make sense, it's pulling to the right (passenger side), so that side is clamping harder...wanting to stop harder, pulling it to the right.

The weird thing I did notice is that out of the three times where I got on the brakes pretty hard.....there was one time where it went completely straight and didn't pull at all. Odd.

As far as I can tell, everything is pointing to a sticky caliper piston on the drivers side caliper. I think I'm going to replace both front lines, and both front calipers......with this truck being 14 years old, and having almost 230,000 miles on it......I can't imagine it's going to hurt at all.

Am I correct in thinking the issues is a sticky piston on the drivers side caliper?

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post #6 of 9 (permalink) Old 04-13-2019, 10:02 PM
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Re: Truck pulls to right when on the brakes....ideas on why?

Could be a sticky piston or a bad hose. if u replace both u should be good.

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post #7 of 9 (permalink) Old 04-13-2019, 10:41 PM
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Re: Truck pulls to right when on the brakes....ideas on why?

Hose usually sticks and holds them on after you release the pedal, but could be collapsed inside.
I would replace both, and both calipers.
I always do them together, and in pairs

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post #8 of 9 (permalink) Old 04-14-2019, 11:48 AM
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Re: Truck pulls to right when on the brakes....ideas on why?

The driverís side sticking means the passenger side grabs harder and pulls to the right. I like the idea with the temp gun!

I agree with Dusty. Usually if one side is bad the other is not far behind. Youíre already opening up the system to replace the caliper and the hoses are cheap by comparison. To know that you only have to bleed the system once and that itís no longer a potential issue itís worth it to me.
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post #9 of 9 (permalink) Old 04-19-2019, 02:52 AM
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Re: Truck pulls to right when on the brakes....ideas on why?

If you cleaned everything up and changed the rotor and pads. You need to replace the caliber because either one or both of the pistons are sticking causing your pulling. This is also the reason your pads and rotor were chewed up. Replace the caliber preferably on both sides, but that's not really needed you can just do the right side.
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