Hello,
i have a snapped switch with the metal section stuck in the master cylinder. I also have a problem with the rear brakes over heating after about 20 miles, even though its had all new calipers, rotors and flexi hoses, could the 2 problems be related? Thank you.
( Robert Longford, 05/23/2022 )
Hi Robert,
Without your VIN I am just guessing you have a W-Series Workhorse chassis based on the part you are asking about. I don't think the two issues are related, but you can pretty easily remove the broken plastic threaded end of that switch from the master cylinder to install a replacement.
As for the rear brakes hanging up, where were the calipers purchased from? If you have installed calipers that are not from Workhorse then they do not have the correct bore diameter, and are known to do just what you are seeing.
The calipers for your chassis look just like other calipers you can buy, but the ones that you need were modified by Bosch for Workhorse so they wouldn't do that. Here is a link for the calipers you need https://www.workhorseparts.com/W8007383-W20-W22-Brake-Caliper-Asm-(66mm)
If you have already installed Workhorse calipers then I would look and see what side of the pads are hanging up. If it is the outside pads then make sure the guide pins are not tight in the bore and are well lubricated. If it is the inside pad, then I would attach a pressure gauge to the caliper and press and release the brake pedal a few times and see if it is dropping all the pressure when the brakes are released. If it is releasing all the pressure then you have a failed caliper, if it is not then it could be many things such as the master cylinder or brake booster and so on.
( Support )
I had my RV in for brake repair. When I picked it up, I noticed the switch had been broken off during the repair. The shop claimed that it was not used because one of the wires had been cut before I brought it in. I can verify that that is correct. However, it broke off at the master cylinder. The threads are still in the body of the cylinder and a steel pin is stcking out. I read on your question page that the master cylnder will not leak and the pin sticking out is no problem. Should I just leave it as is, or get the shop to easyout the switch and replace?
My vehicle is a 2002 Fleetwood Southwind RV.
Thanks for your consideration
David Cole
( David Cole, 09/22/2021 )
Hi David,
I would have that extracted, it is not too bad to get out since it is plastic. I have had good luck just driving a flat head screwdriver in there being careful of the threads in the master, then just turning it out of there. That switch warns you if your brake pedal is traveling too far, so you should have it operational.
( Support )
My pressure switch broke off at the edge of the master cylinder. The metal rod is sticking out. The plastic threads are in the cylinder. If I do nothing will brake fluid lead out? If I glue the pressure switch to the
master cylinder will it still work? If I do not use it should I cap off the wires running to the switch? I'm afraid to change the switch because I don't want something to go wrong and have to replace the master cylinder.
( Patrick, 12/17/2020 )
Patrick, no brake fluid will leak out , if the contacts are in position glue may work. The switch is a safety item and we recommend keeping the brake system completely operational due to potential liability concern . ( Support )
i replaced the pressure switch and the brake failure light came and stayed on. i read previous answer so i went out to clean any debris and found none..now the question.how deep is the hole that the switch pin goes into? i have the threaded part,then a machined face and a hole in the middle of that and its only about 1/4-3/8 deep, it looks to me that master cylinder did not reset,is that possible?i have never had a brake failure light before. i have had abs light come on and then go back out 10 min later.other then that the brakes have allways worked good
( gregory BROWN, 10/21/2020 )
That master switch is activated by a groove in the rod inside the master, when that groove lines up with the switch the brake failure light comes on with the buzzer (if the speaker is not blown) sometimes that rod gets stuck and you cannot unstick it so you have to replace the master cylinder
That groove lines up with the switch when the brake pedal goes down too far, like when you bleed the brakes
( Support )
My w8000130 pressure switch broke off clean with just the pin sticking out of the master cylinder.
What is the purpose of this switch and what will happen if I don't replace it.
( Gary Moore, 07/13/2020 )
The differential pressure switch reacts to a loss of master cylinder hydraulic pressure in either side of the split hydraulic system and can illuminate a warning light at the instrument panel. When pressure is lost in either the primary or secondary circuit of the master cylinder, the switch closes. The electrical switch will remain closed until the malfunction is corrected. When both systems develop normal pressure, the switch will return to center and open the electrical switch circuit. A mechanically latched connector is attached to the switch. The switch has two tabs on a common terminal (positive) and is grounded through the master cylinder.
In most instances, you can continue operating the vehicle without this sensor being used but it won't alert you to a pressure issue in your master cylinder.
( Support )
my brake pressure switch broke off flush with master cylinder. how do i get the rest of it out? is the switch in the fluid? can i drill it and use a easy out? will i have to bleed out brake lines when i am done? thanks.i have already ordered my part w8000130.
( GREGORY BROWN, 07/05/2020 )
You will need to extract the plastic threaded piece the best method you see fit but you will not need to bleed or worry about fluid coming out. ( Support )
How do I remove the plastic threads that broke of clean at the master cylinder housing with the pin still inside the housing. I will be ordering pressure switch # W8000130 Thanks
( Gerald L Robben, 01/30/2020 )
You will basically just have to use a small pick/screwdriver and carefully extract it. ( Support )
Does this pressure switch fit our 2002 F650?
( Rachelle Loncarevic, 09/10/2019 )
We are not able to VIN verify, but, as long as your truck has the Bosch Hydromax brake system then it should work. We have had previous customers with this vehicle that have ordered and it fit. ( Support )
My problem is that I tried installing a new sensor and couldn't get it in and now see that the first part of the plastic threads are striped. I think that I might have damaged the female threads in removing the old piece. :-( So someone suggested that I get a "tap" and clean those threads. The burrs appear only at the beginning. So the big question....Can you tell me what size tap I need and is it considered to be a standard thread??? I sure got myself in a pickle. Thxs.....The part is W8000130....
( Charlie Burg, 06/21/2018 )
The W8000130 has plastic threads so you shouldn't need to go as far as a tap. You should be able to extract it with a pick and a bit of patience. ( Support )
What is the part number for the pigtail used for brake switch W8000130
( Denny Bass, 07/19/2017 )
The part# for the pigtail is 12102620. It is special order but it is available. ( Support )
i REPLACED THIS W8000130 SENSOR AND NOW HAVE A BRAKE FAILURE ALARM. HOW DO I FIX IT?
( Craig Winn, 07/03/2017 )
remove the sensor again and clean out any debris that may be in there using a pick and reinstall the switch. This will usually fix that issue. Let us know if it does not and I can assist further. ( Support )
I am interested in purchasing the Pressure Switch, but $23 for shipping is a bit too much. What is you cheapest shipping for this small object. Thanks,
( Bert, 01/15/2016 )
Burt,
If you give us a call we can discuss alternate shipping methods that might save you some money. 800-417-4559.
( Support )
what does the switch do
( jim, 12/04/2015 )
In the center of the Combination Valve (which is where the sensor screws into) is a single wire connector that works in conjunction with a slide in the center of the valve. If brake pressure is lost to either the front portion or the rear portion of the system, the switch grounds and illuminates a warning light in the instrument cluster. This is a warning that something is wrong.
( Support )
If you remove this switch, does fluid run out of master cylinder. How to replace this switch.
( Dale Nikula, 09/11/2015 )
Dale,
No you will not lose any fluid. The switch simply screws into the master cylinder body, however, you must be very careful as it has plasic threads so it is very easy to strip it out.
( Support )
The state of California requires that this warning be posted for people purchasing products that reside in California.
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