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Jared D
Jared D, ASE Certified Technician
Category: Ford
Satisfied Customers: 1652
Experience:  Shop Supervisor at County Fleet
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What would cause a 2002 ford ranger rear brakes to lock up

Customer Question

What would cause a 2002 ford ranger rear brakes to lock up before front. I've replaced the master cyl, front pads and rotors, rear brake shoes, and a leaky line and bleed about 2 gals of fluid threw system
Submitted: 1 year ago.
Category: Ford
Expert:  Jared D replied 1 year ago.

There is a proportioning valve that is supposed to limit the amount of fluid to the front or rear brakes since they require different amounts of pressure to operate. If the rear brakes are locking up and the fronts are hardly working, the proportioning valve is probably stuck one way or the other.

Do you have a brake light on? It usually triggers the brake light when this is acting up.

Also is your truck equipped with ABS?

Customer: replied 1 year ago.
abs equipped no brake light on
Expert:  Jared D replied 1 year ago.

Is your truck 4wd or 2wd?

Expert:  Jared D replied 1 year ago.

Does it sound like the condition in this TSB is happening?

Customer: replied 1 year ago.
4wd
Customer: replied 1 year ago.
It did the same thing with the old rear linings and drums. But if I pinch off the rear rubber hose the peddle is stiff but no stopping power
Expert:  Jared D replied 1 year ago.

Does it look like the front brakes are applying when the vehicle is not moving? In other words does it seem like the front brakes don't work only when moving?

Customer: replied 1 year ago.
They are working when bleeding but it's like not enough pressure or its activating rear first
Expert:  Jared D replied 1 year ago.

Have you bled the hydraulic control module with a compatible scan tool? The only way to get it to bleed is with a scan tool. You could try to drive it on a dirt road and do a couple of skid stops to try to get it to self bleed, but it's not the best way to do it.

If you have, I would probably replace the proportioning valve. The problem with that is that they are really expensive and then you will still have to bleed the system with a scan tool. Here is the part number from Ford: 1L5Z2C219EA

Customer: replied 1 year ago.
I did the dirt road skids and got the abs to activate but I have to pump peddle a few times then slam on to do so. We're is the proportion valve located
Expert:  Jared D replied 1 year ago.

The proportioning valve is a combination valve that is just below the brake master cylinder.

Customer: replied 1 year ago.
Nothing below master cyl
Customer: replied 1 year ago.
Only thing below master cylinder is this
http://www.ebay.com/itm/like/321649760277?ul_noapp=true&ul_ref=http%253A%252F%252Frover.ebay.com%252Frover%252F1%252F711-117182-37290-0%252F2%253Fmtid%253D1588%2526kwid%253D1%2526crlp%253D53601919689_324272%2526itemid%253D321649760277%2526targetid%253D147250982889%2526rpc%253D0.15%2526rpc_upld_id%253D58938%2526rlsatarget%253Daud-151107829449%253Akwd-147250982889%2526device%253Dm%2526mpre%253Dhttp%25253A%25252F%25252Fwww.ebay.com%25252Fulk%25252Fitm%25252Flike%25252F321649760277%25253Flpid%25253D82%252526chn%25253Dps%2526adtype%253Dpla%2526loc%253D9004077%2526poi%253D%2526campaignid%253D239125209%2526adgroupid%253D14978428809%2526gclid%253DCKXToujnq8kCFZOCaQod1fICLQ%2526srcrot%253D711-117182-37290-0%2526rvr_id%253D937306387536&chn=ps&lpid=82
Expert:  Jared D replied 1 year ago.

It looks like on the 2002 6 cylinder with 4 wheel abs the proportioning valve and the hydraulic control unit, the picture you sent, are one unit. On the 4 cylinder they have an option of 2 wheel anti lock which has a separate proportioning valve that runs off of the bottom of the master cylinder.

I assume from your picture that you have the 6 cylinder. You will likely need to replace the hydraulic control module, but keep in mind it will need to be bled with a capable scan tool.

Customer: replied 1 year ago.
Could it just need to be bleed with scan tool to work right since the system did run dry from a bad line
Expert:  Jared D replied 1 year ago.

I think it probably just needs a bleed with a scan tool.

Customer: replied 1 year ago.
I'll give that a shot and let u know
Expert:  Jared D replied 1 year ago.

Sounds good.

Expert:  Jared D replied 1 year ago.

Let me know if you need any more help.

Please don't forget to rate. They don't pay us if we don't get a positive rating.

Expert:  Jared D replied 1 year ago.

Let me know if you need additional information. I would love to help if you still need assistance.

Don't forget to rate. We don't get paid if we don't get a positive rating.