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Old 05-21-2022, 01:41 PM   #1
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Brake fluid flush

I’m gonna flush my brake fluid. For those that have done it, how much fluid might I expect to use?
2001 Alpine 36 mdds
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Old 05-21-2022, 01:54 PM   #2
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If you plan on completely changing/flushing the brake fluid I use and least 1 Gallon. On my 2001 I first drain the master cylinder divorced reservoir by disconnecting the line at the bottom than refilling with fresh fluid and I start my Flush. Right front wheel first since it is the longest line from master cylinder. Remember the brake lines go to the rear of the coach where the ABS modulator is located and returns to the front of the coach. The brake lines for the front calibers are at least 40 feet long and the rears are about 30 feet long to the caliber.
Dave Fernandez
2001, 38ft FDDS, 350 ISC, Tow 2004 Yukon
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Old 05-21-2022, 03:58 PM   #3
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I used three quarts of DOT4 when I replaced all four dual piston calipers. (and all brake pads, rotors, hoses etc) As Dave said, drain the reservoir first. If you have the two piston floating calipers now is a good time to disassemble and lube the caliper slides. Not a huge job, just bigger stuff.
2000 Alpine 36 FDS #74058
04 Jeep Wrangler TJ
"On the road to find out..."
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Old 05-21-2022, 05:31 PM   #4
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Here is how the brake system lays out:

I used 4 32 oz (1 gallon) bottles of brake fluid.

I have a tool to suck out the old brake fluid from the reservoir.

It takes a full bottle plus a little to fill the reservoir with fresh fluid.

I used a Motive Products Power bleeder to force in the new fluid. I bought this because I normally do not have a helper. It works, but the process is slow. Order the kit with the Chrysler Cap. As a bonus, it fits my Jeep too.

You need to get your coach up a little to be comfortable under the coach. I use 2 layers of 2x12 board under each wheel. I also put the jacks down. I do NOT bleed the air out of the bags before I lower the jacks.

Given the layout of the brake lines, I don't think it matters much which wheel you do first. You do need to run more fluid through the first wheel you do to clear the line to the ABS modulator as well as the line to your brake caliper. I did the passenger rear first and used nearly a full bottle of brake fluid there. I did the driver's rear next and only used 1/2 a bottle of brake fluid. I did the passenger front next and then the driver's front. I used 3/4 of a bottle on each wheel. I find it difficult to tell when the fresh fluid is coming through by color. The old fluid is darker when I start, but the color change is gradual. Like I said, the power bleeder is slow. The best thing about it is you are less likely to run the fluid low in the reservoir using the power bleeder.

If you are using a partner to help bleed the brakes, be advised that it takes some leg power to push the pedal down when the engine is off.

There is a "modern" method for bleeding brakes, different than what I learned when I was a boy. Do not pump the brake pedal. Have your helper push on the pedal, open the bleeder so the pedal goes to the floor, close the bleeder, release the pedal. If you are using this method, check the reservoir frequently. I'd be most comfortable if I had a second helper to watch the brake fluid reservoir while bleeding the brakes.
2001 Alpine Coach 38/8
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Old 05-21-2022, 06:21 PM   #5
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Thanks, guys.
2001 Alpine 36 mdds
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Old 05-22-2022, 06:32 AM   #6
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I have 2 sets of 4 piston rebuilt calipers for sale. I got extras when I did my brake job and didn't need them. Very heavy to ship. Live in central Illinois.
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brake, fluid

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