Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Alpine Coach Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-05-2009, 06:57 PM   #1
Junior Member
 
Join Date: Jan 2009
Location: NJ
Posts: 17
Brake Booster Question

I have a 2001. My ABS light has come on and while troubleshooting that I found a broken sensor on the Hydro Max brake booster. There is an old posting on this ....did anyone know what this sensor is for, where to get a replacement? The Bosch technical data shows only a flow sensor. This broken sensor is on the inboard side of the booster. Other than the ABS light I haven't has any problems with the brakes.
__________________

__________________
TedG is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 11-05-2009, 07:44 PM   #2
Senior Member
 
Algoma's Avatar


 
Join Date: Nov 2007
Location: Charleston, WV
Posts: 2,640
That sensor is the differential pressure switch. It will activate the brake light if there is a difference in the hydraulic pressure between the front and rear brakes, i.e. there is a leak somewhere. Mine was also broken and I had to replace the hydromax master cylinder. Not cheap!
__________________

__________________
John and Mary Knight
2015 Newmar Ventana 4311 - wheelchair accessible
2015 Cadillac SRX Luxury AWD
Algoma is offline   Reply With Quote
Old 11-06-2009, 02:44 PM   #3
Junior Member
 
Join Date: Jan 2009
Location: NJ
Posts: 17
Brake Booster Question

Thanks, It took awhile but I found a P/N for the switch and have one on order. I spoke to Bosch and they said the switch is replaceable. Getting the broken part out should not be a major problem.
__________________
TedG is offline   Reply With Quote
Old 11-08-2009, 05:50 PM   #4
Senior Member
 
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,217
TedG- could you post the part # and your source for ordering? Thanks.
__________________
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
EngineerMike is offline   Reply With Quote
Old 11-08-2009, 07:50 PM   #5
Junior Member
 
Join Date: Jan 2009
Location: NJ
Posts: 17
Brake Booster Question

I was going to wait until the switch came in on Tuesday to be sure it's the correct part, but here's what I have. If I get the wrong part I'll update Tuesday. I ordered it through Hoover Truck Center here in NJ.

There's only one differential pressure switch for this master cylinder, chassis mfg use their own P/N. Hoover was able to cross reference the Ford number to the Freightliner number.

Bosch P/N 2232548
Ford P/N E1EC-2B264-AB
Freightliner P/N E2FZ-2B264B

I got the info from Dave Smith at Bosch, 574-237-2038. Very knowledgeable and helpful. He gave me the Bossch and Ford numbers.
__________________
TedG is offline   Reply With Quote
Old 11-10-2009, 03:49 PM   #6
Junior Member
 
Join Date: Jan 2009
Location: NJ
Posts: 17
Brake Booster Question Update

I received the correct switch. It's a Ford part, P/N 6U9Z-2B264-A. Not cheap...$70.00 with tax.
__________________
TedG is offline   Reply With Quote
Old 11-12-2009, 01:55 PM   #7
Senior Member
 
Lindenberg's Avatar
 
Join Date: Aug 2006
Posts: 281
Ted,

Mine is also broken right where it enters the brake booster. Must be a poorly designed part.

The one on my 2000 is a green plastic part with a single electrical connection. Does this sound like the replacement Ford part you received? Does it screw into the brake booster? If yours is broken at the same place, how did you get the broken piece out of the brake booster? Do you need to re-bleed the brake lines after replacing the part?
__________________
Tom & Laurel

2000 Alpine Coach Limited 36FDS
Lindenberg is offline   Reply With Quote
Old 11-12-2009, 04:59 PM   #8
Junior Member
 
Join Date: Jan 2009
Location: NJ
Posts: 17
Brake Booster Question

The diffrerential pressure switch is on the master cylinder, inboard side. There is a switch mounted on the top side of the brake booster. It's a flow switch, and if it's not working your backup pump won't work.

These switches electrical connectors look the same. I don't know about the flow switch but the differential pressure switch is a mechanical switch, has a metal plunger tha activates when either front or rear brake pressure changes....a leak in front or rear brakes.

The weather is bad so I haven't got the broken part out. My plan is to use a small easyout. The threads are plastic so it should come out without much effort. Not sure if I can get it without removing the master cylinder, but if I can no bleeding of brakes is required.
__________________
TedG is offline   Reply With Quote
Old 11-20-2009, 01:19 PM   #9
Junior Member
 
Join Date: Jan 2009
Location: NJ
Posts: 17
Brake Booster Question Update

Removing the broken plastic part of the differential pressure switch from the master cylinder with an easyout didn't work out. I removed the master cylinder (4 bolts to remove it from the brake booster) , used a heat gun to soften the plastic , and removed it with an awl. Cleaned up the threads and installed the new switch. Reinstalled the master cylinder and good to go.

I refilled the master cylinder reservoir and let it gravity feed through the master cylinder before connecting the output lines. The brakes are fine, pedal does not pump up so no need to bleed them. However I may go ahead and bleed them just to get some new fluid into the system.
__________________

__________________
TedG is offline   Reply With Quote
Reply



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Workhorse Brake Recall peskyfeller Workhorse and Chevrolet Chassis Motorhome Forum 91 10-15-2013 07:10 PM
Aux tow brake install Oemtech Toads and Motorhome Related Towing 11 06-17-2010 08:34 PM
J72 Auto Park brake question mygrayhound Workhorse and Chevrolet Chassis Motorhome Forum 4 08-16-2009 10:54 PM
W-20 brake caliper question RottenRalph Workhorse and Chevrolet Chassis Motorhome Forum 17 03-15-2008 07:46 PM
Brake Buddy Question Toads and Motorhome Related Towing 9 10-27-2007 06:28 AM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:38 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.