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Old 07-17-2019, 12:19 PM   #1
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Dives to the right on braking

Recently I purchased a 2004 Newmar Mountain Aire workhorse. On braking, it dives to the right. Suggestions as to what may be causing this.
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Old 07-17-2019, 12:25 PM   #2
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The left front caliper is seized and not applying the brake to that wheel.
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Old 07-17-2019, 12:27 PM   #3
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Does it seem to pull the steering wheel, or does the coach move over?
There are several possible causes, one could be the left front brake not actuating if the steering wheel moves.
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Old 07-17-2019, 12:30 PM   #4
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Mis-adjusted front brakes.
Contaminated( oil/grease on lining) lining on one of the front brake linings.
Faulty brake line/hose (pinched, internally collapsed) on one side.
Leaking air brake chamber
Bad S-cam bushings on one side or seized anchor pin

I'm assuming the Coach has air brakes... if hydraulic, add "bad wheel cylinder" and "air in line".
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Old 07-17-2019, 12:52 PM   #5
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My money's on leaking/frozen left front caliber or left front wheel bearing oil bath seal is leaking. Do you know if the Bosch brake recall has been complied with?

Oh, and welcome to the site...
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Old 07-17-2019, 01:03 PM   #6
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Does it dive to the right and then even out, or does it keep pulling to the right as long as you've got your foot on the brake?
I had one that would briefly pull left and then straighten out. On mine that was an indicator that the right side rubber hose to the front brake was partially collapsed inside, causing that brake to react slowly. Replacing the line fixed the problem.
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Old 07-17-2019, 02:55 PM   #7
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Quote:
Originally Posted by CountryB View Post
Mis-adjusted front brakes.
Contaminated( oil/grease on lining) lining on one of the front brake linings.
Faulty brake line/hose (pinched, internally collapsed) on one side.
Leaking air brake chamber
Bad S-cam bushings on one side or seized anchor pin

I'm assuming the Coach has air brakes... if hydraulic, add "bad wheel cylinder" and "air in line".

Bad assumption - he said it is a Workhorse, so it's a gas rig, not diesel...
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Old 07-17-2019, 03:07 PM   #8
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Quote:
Originally Posted by scenic route View Post
My money's on leaking/frozen left front caliber or left front wheel bearing oil bath seal is leaking. Do you know if the Bosch brake recall has been complied with?

Oh, and welcome to the site...
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Old 07-17-2019, 03:59 PM   #9
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brake hose

If it does quick dive then evens out its likely the flex/rubber brake hose is internally collapsed. It won't look damaged and can't really feel it either but odds are that's what it is. relatively cheap and easy fix too.
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Old 07-17-2019, 04:08 PM   #10
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It doesn't really matter what particular brake item it is. The Bosch made Workhorse brakes were problematic. You need to get it to a brake shop, rebuild or replace the calipers, turn or replace the rotors, pack the wheel bearings and replace both brake hoses on the front end. Once done, the system needs to be bled. This should resolve any issues, give you piece of mind and resolve all the Workhorse problems.
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Old 07-18-2019, 05:21 AM   #11
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Cause and effect. The effect is that by stepping on the brake pedal the effect is a radical difference in rolling resistance of the steer tires. This causes the self-steering effect that is transmited to the steering wheel. IMO equal braking power of the front brakes needs to be restored.
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Old 07-18-2019, 07:53 PM   #12
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Rears could be the issue as well. Seen it first hand.


Anytime 1 side is braking more than the other it will pull to the opposite side.
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Old 07-18-2019, 08:14 PM   #13
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Ditto on left front hub.
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Old 07-18-2019, 09:26 PM   #14
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Post Air Bag Suspension Kit for RV Pulling to the Right!

I had this same issue just recently with my Workhorse. As some stated, I had the brakes; calipers and rotors replaced (it definitely needed them) But, the RV still pulled to the right when braking or simply taking both hands off the wheel. We discovered that the Air Bags were in terrible shape. We ordered the Air Bag Suspension kit and had them installed and tech even went the extra mile and installed the fill valves run to the drivers side for easy access. This immediately fixed the pulling and she rides like a dream now! Oh and added note, we considered the air bag compressor, but found out that they are not as functional as once thought. It is very difficult to adjust the PSI in both air bags and from what I understand, the compressor only allows you to put equal amounts in each air bag. If this is untrue, please let me know. We are heading out west in 4 days for a 3 week adventure. After all this money and time we put in to get it ready, we just found out that the Fridge is not cooling. The Freezer is great, but can't get the fridge cool on AC or Propane. I posted my question earlier tonight and am hoping to get some tips on that post. If anyone can check out that post too and help out, we would greatly appreciate it. Be safe this summer
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