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Old 09-28-2020, 06:11 PM   #1
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Holiday Rambler Owners Club
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2003 Holiday Rambler Ambassador 38pst brake master cylinder replacement

Last week brakes failed in Flagstaff Az. Towed to a shop but having problem finding a replacement for the master cylinder. Per the mechanic the master cylinder failed and of course Roadmaster does not make chassis any more.
Mechanic having trouble finding the part or a rebuild kit
Any ideas on where to find a replacement master cylinder??
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Old 09-28-2020, 07:15 PM   #2
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Please provide the part number
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Old 09-28-2020, 07:25 PM   #3
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most likely all he needs to get you back on the road is the rubber cup in the master cyl soo get the old one out and go to a parts house look in the wagner or what ever brake parts book they have find a kit that has the same size rubber cup and purchase it and get cup out and fix your master cyl !
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Old 09-28-2020, 08:26 PM   #4
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BRAKE MASTER CYLINDERS - BENDIX - powerbrake-drivetrain
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Old 09-29-2020, 09:11 AM   #5
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Do not have part number waiting on info from mechanic
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Old 09-29-2020, 10:22 AM   #6
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I think you have the "air-over-hydraulic" brakes. Is that correct?

Can you provide a photo?

These are the types of hydraulic brake systems (most commonly) used.
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Old 09-30-2020, 11:05 AM   #7
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Master cylinder for 2003 holiday rambler ambassador

I do not have the part number or a photo at this point .
I had my coach towed to a shop near Flagstaff Az and had to go home to Mexico in my Jeep to take care of personal matters . I am waiting for answers from the mechanic.
The brakes are definitely air over hydraulics on a 2003 Roadmaster chassis.
I think they are Bosch brakes but not sure.
Thank you for the information in the diagrams.
Still in limbo
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