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Disc Brake Conversion
https://policeinterceptor.com/revconforums/viewtopic.php?f=14&t=88
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Author:  wimpy88 [ Sat Mar 05, 2016 8:21 pm ]
Post subject:  Disc Brake Conversion

Daveinet wrote:
Probably the most practical modification has been to convert the rear axles to disk brakes. I highly recommend this modification, as the stock brakes are marginal at best. Its not real expensive, and is a direct bolt on upgrade. Because drum brakes depend on the rotation of the drum to activate, this means there is always a delayed response when applying the brake. Disk brakes do not have that delay, and that is often the difference between a moderate hard braking and a sheer panic stop. I never realized the delay was there, until I installed the disk brakes and it went away. Its an amazing difference to be able to stop the coach with confidence.

Could those who have done the conversion point to options available or used?
Are we looking at using new parts (vendors used) or converting using salvage parts?

Author:  Daveinet [ Sat Mar 19, 2016 8:24 pm ]
Post subject:  Re: Disc Brake Conversion

I noticed your signature shows your coach as having Dexter axles. Up until 1982, Revcon used Wolverine axles. The difference is recognized by the fact that the Wolverine axles are square, and the Dexter axles are round. So it is worth making sure which axle you really have, before buying the conversion kit. Revcon did some random customization, so anything is possible, but if yours really is Dexter, it would probably be the only one.

The kit I used was this one, only for some reason it is 200+ more than what it was when I bought it. All the kits have gone up in price, but that specific kit went up more than the other ones. I specifically chose the kit with the stainless steel calipers, because stainless is a poor conductor of heat. This reduces the transfer of heat from the pad to the fluid, so the fluid is less likely to boil. Any of the 8K kits would work.
http://www.etrailer.com/Trailer-Brakes/Kodiak/K2HR89DDS.html
The kit is an exact fit and does not require any modifications. You will need to remove the proportioning valve, and just run the lines straight to the calipers. The OEM proportioning valve keeps about 10 PSI of pressure in the lines to hold the pads close to the shoes. This is not needed with disks, and will wear out the disks prematurely. It also screws up the response time.
The only other issue is that you are loosing the emergency brake. In my case, the e-brake never worked anyway, so no loss on loosing it. If you consider the over all safety of the conversion, it is my opinion that safety increase from switching to disc brakes far out weighs the loss of the e-brake.

Author:  jagman_xjs [ Wed Mar 08, 2017 6:12 pm ]
Post subject:  Re: Disc Brake Conversion

Where can I get this conversion kit ? My brakes SUCK.

Author:  Daveinet [ Tue Mar 14, 2017 12:30 pm ]
Post subject:  Re: Disc Brake Conversion

Did you try the link in my post? What year coach do you have?

Author:  Brandon [ Thu Jun 15, 2017 5:35 pm ]
Post subject:  Re: Disc Brake Conversion

Hi Dave,

Looking at doing this modification, I had a question about your statement regarding the proportion valve.

I see on page 126 from The user guide that the master cylinder has two outputs that go into a combination valve and then three outputs, two going to the front disc brakes and one going to the rear drum brakes.

From this webpage that explains combination valves it shows the the proportion valve part having an input and output.

Am I correct in assuming you are saying to take the brake line that comes out of the master cylinder and directly sending it do the new rear disc brakes? What did you do about the pressure differential switch or does the Revcon not have one?

What do you think of the addition of an inline hydraulic handbrake as an e-brake?

Any insights are appreciated.

Thanks,
Brandon

Author:  Daveinet [ Mon Jun 19, 2017 4:37 am ]
Post subject:  Re: Disc Brake Conversion

Get rid of everything and connect the master cylinder directly to the brakes. hook one line to the front and the other line to the rear. The rears do out brake the fronts slightly, but that doesn't seem to be a bad thing.

There was a pressure differential switch integrated into the proportioning valve, but I have ignored it. Normally when brake lines go, it bursts, so the "early" warning of a light isn't telling you anything you don't already know. I did blow a rear brake line, and the front still worked, so i was still able to get stopped. In reality, the since the front brakes are not applied till the rear sees pressure. If the rea line brakes, the front stop working as well.

Author:  wimpy88 [ Fri Jun 23, 2017 1:49 am ]
Post subject:  Re: Disc Brake Conversion

Dave, thanks for taking the time to contribute your knowledge to the forum.

Would it make sense to convert 1 of the 2 rear axles to disc brakes & use the other for the emergency brake?

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Author:  Daveinet [ Sat Aug 19, 2017 1:13 pm ]
Post subject:  Re: Disc Brake Conversion

Woops, delayed reply - didn't notice this question till now. the answer is no. The difficulty is that drum brakes require about 10 lbs of pressure in the line to keep the brakes in close proximity to the drum. That 10 lbs will wear and potentially overheat the discs. That is why you need to get rid of the proportioning valve. The preload valving for the drums is built into the proportioning valve. If you get rid of the proportioning valve, and still have 1 set of drums, you will have too much peddle travel.

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