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Old 02-09-2013, 04:28 PM   #1
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Coach Hydraulic brake system has quit!

2003 Alpine 40' cummins 400 with Hydraulic brakes.

I was trouble shooting a LED tail/stop/turn light poblem on the rear with the brake pedal partially depressed to turn on the stop lights.

Suddenly I hear the Brake Hyd. pump quit. It had been on for a while.

I have looked all over ( except the right place) for a fuse or circuit breaker.
The manual that I have covers the coach but not the chassis at all.

I looked under drivers floor at the master brake control etc. and only found a unit with two diodes. I looked at the 4 fuse boxes in the front dash area but didn't see a fuse nor a CB labeled for brakes?

Does anyone have experiance with this system? Who makes it?
I sure would like to get a chassis wiring diagram and something that tells you where components are located??????????????
jeskehomes@sti.net
or even 209 966-5099
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Old 02-09-2013, 05:51 PM   #2
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On an '05, if you run the slide out it is an inline blade type fuse located on the passenger side above where the 2 large thru the wall 12 connectors are located. Good luck.
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Old 02-09-2013, 06:03 PM   #3
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I am assuming you did not have the engine running, so what you heard was the Hydromax backup pump running. This has nothing to do with the engine driven hydraulic pump so you have not lost normal brake operation. There is information on the Hydromax on the ACA technical website. My backup pump burnt out and I had to have it replaced so it may be more than just a blown fuse. Apply 12v directly to the pump motor on the master cylinder and then work backwards.
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Old 02-10-2013, 07:10 AM   #4
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I forgot to mention that the backup pump is turned on by the brake light switch, so if you were playing with that it would have stopped the pump from working. I have just replaced my stop switch as it failed while traveling to Florida. I only noticed because cruise control would not disengage when I braked and that is also controlled by that switch.
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Old 02-10-2013, 08:37 AM   #5
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Thank both of you for the responses.
My brakes do work when the the engine is running.
I found the manuals on the forum data page and they have been a hugh help.
I have to check out the electrical as noted and see if that is the trouble.
Covering all angles, John, where did you buy the replacement? I have looked on the internet with no luck yet.
I have that horrible feeling that I probably ran it toooo much or toooo long and burned it out.
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Old 02-10-2013, 09:24 AM   #6
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I had mine replaced at a Freightliner shop along with the master cylinder as I had extended warranty at the time. I looked up my receipt and here is a link to the part # for the pump. ASL 2772302
Yours is a later model coach so this may not be correct for you.
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Old 02-10-2013, 10:37 AM   #7
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Brake light / backup motor problem

I started the engine and depressed the brake pedal and wedged it that way to keep the switch accuated.

There was no voltage to the motor and then found no voltage to the stop switch which as I read the manual schemematic supplies the voltage to the flow switch and then the relay to actuate the motor.

I put all 3 slides out and there were no fuses etc.

I have studied the fuse boxes on the front kick panel in front of the steps and don't see a stop light one.

After church I will take the fuses out one by one and check them.

If anyone knows where the stop light fuse is on the 2003 40' PLEASE let me know.

Does anyone know if there is a wiring diagram for the chassis? All the diagrams in the Aline manual are for the coach..not the chassis.

When the pump quit I was not touching wires which leads me to the feeling that the motor locked up and blew the fuse....... Ba hum bug
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Old 02-10-2013, 10:55 AM   #8
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You won't get voltage at the backup pump if you are running the engine as the flow-switch will be open (it is a NC switch). There should always be voltage to the brake light switch. Do your brake lights come on when you put your foot on the brake pedal? If not then either the brake switch is bad or a fuse is blown. Can't help you find the fuse as my layout is different to yours.
The only way to test the pump independently is to put 12v directly on the motor stud.
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Old 02-10-2013, 02:39 PM   #9
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The stop lights WERE working until the pump quit..IE probably the a fuse IF I COULD find it.
Thanks for the link I will check into it.
I was also thinking that IF it is bad that the motor is similar to a starter motor and a starter repair shop might be able to fix it.

THanks again. I will post the results.....when I have some.
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Old 02-10-2013, 06:50 PM   #10
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Trainstop

I think the slide he is referring to for the location of the fuse is the generator slide
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Old 02-11-2013, 02:24 PM   #11
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Hi everyone: GOOD NEWS!
I found the "brake light/backup pump" fuse.
I am not sure why, but I didn't understand the abreviations on the "unswitched" fuse box under the right front dash. The 15 amp was blown. When replaced all worked correctly.
The GOOD part is that I learned alot about the brake system.
Fortunately the backup pump seems to operate with no difficulty.

I found (5) 12v fuses on the inside panel of the battery box.
Anyone have a clue as to what they are for??? They were all good.
Ray
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Old 02-16-2013, 12:59 AM   #12
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Quote:
Originally Posted by Trainstop2 View Post
2003 Alpine 40' cummins 400 with Hydraulic brakes.

I was trouble shooting a LED tail/stop/turn light poblem on the rear with the brake pedal partially depressed to turn on the stop lights.

Suddenly I hear the Brake Hyd. pump quit. It had been on for a while.

I have looked all over ( except the right place) for a fuse or circuit breaker.
The manual that I have covers the coach but not the chassis at all.

I looked under drivers floor at the master brake control etc. and only found a unit with two diodes. I looked at the 4 fuse boxes in the front dash area but didn't see a fuse nor a CB labeled for brakes?

Does anyone have experiance with this system? Who makes it?
I sure would like to get a chassis wiring diagram and something that tells you where components are located??????????????
jeskehomes@sti.net
or even 209 966-5099
Engineer Mike has electrical drawings for most all coaches.
Joe
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Old 02-17-2013, 08:19 AM   #13
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Engineer Mike?
How do I contact him?
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Old 02-17-2013, 08:57 AM   #14
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You can send him (or anyone on this website) a personal message in one of 2 - ways. 1) Click on his name listed (underlined link) in a current post on the main page and use "Send Personal Message", or 2) Use the "User CP" function in the top banner to send a new message and entering "EngineerMike" as the recipient name.
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