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Old 06-25-2018, 07:25 PM   #15
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If someone wants to replace the calipers on a 17 year old vehicle because the brakes are locked I'm certainly not going to recommend he not do that. I say "more power to you" because it can't hurt. If the calipers are seized, I would wonder about the master cylinder also. But that is just me.

To the OP, please let us know who it all goes. I'm for one very curious and I take every chance to learn something new.
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Old 06-25-2018, 07:54 PM   #16
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Originally Posted by BRex45 View Post
A brand new vehicle, if allowed to sit outside for a year, could have the same situation where the disc pads are lightly rusted to the rotors. Are you going to say those calipers need replacing and new fluid too?
No one said that he should change calipers, op said he ordered them and I said that's his best bet (since he already ordered them) Along with new fluid

In your case if you can't get them loosened up I would pull calipers and inspect and go from there, actually I would have done that in his case too but he said he already ordered new calipers...
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Old 06-26-2018, 08:38 PM   #17
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Just a couple points, hydraulic brake fluid is hydroscopic which means it absorbs moisture. Moisture has two negative effects, the first is that it lowers the boiling point so if you overheat the brakes in heavy brake applications it can boil the fluid off and give you brake fade. Not likely to happen in a motor home but moisture could lead to a spongy pedal. The other problem with moisture in the system is that it can cause components to rust, such as the calipers.
As a rule of thumb the system should be flushed at least every other year, and every year if you’re on top of your game.
On the calipers, I would pull them off and inspect them and the pads. You can take a set of welding vice grips and compress the cylinder and see if they are frozen. If so, replace.
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Old 06-26-2018, 09:17 PM   #18
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Just a couple points, hydraulic brake fluid is hydroscopic which means it absorbs moisture. Moisture has two negative effects, the first is that it lowers the boiling point so if you overheat the brakes in heavy brake applications it can boil the fluid off and give you brake fade. Not likely to happen in a motor home but moisture could lead to a spongy pedal. The other problem with moisture in the system is that it can cause components to rust, such as the calipers.
As a rule of thumb the system should be flushed at least every other year, and every year if you’re on top of your game.
On the calipers, I would pull them off and inspect them and the pads. You can take a set of welding vice grips and compress the cylinder and see if they are frozen. If so, replace.
Actually, it's very likely in a MH or any heavy truck. The brakes have to stop the inertia of a far heavier vehicle so heat builds up quickly. In addition, many RV owners don't know they should save the brakes for stopping and use a lower gear for slowing. Using the brakes to slow the heavy vehicle can cause brake failure very easily. That's why many long descending grades have 'Truck run off' ramps, very seldom are they needed by a car or light truck.
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