# 2020 Toyota Tacoma - Rear brake lock up **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** toyota\ **Created:** [July 20, 2021, 1:55pm UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152 "2021-07-20T13:55:11Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Cw09](https://avatars.discourse-cdn.com/v4/letter/c/96bed5/32.png) [@Cw09](https://community.cartalk.com/u/Cw09)\ **Post date:** [July 20, 2021, 1:55pm UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152/1 "2021-07-20T13:55:11Z")
My rear brakes keep locking up, the dealer has fixed it 3 times and the problem has yet to be rectified ---
**Author:** ![weekend-warrior](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/weekend-warrior/32/26122_2.png) [@weekend-warrior](https://community.cartalk.com/u/weekend-warrior)\ **Post date:** [July 20, 2021, 3:26pm UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152/2 "2021-07-20T15:26:54Z")
I am not familiar with your truck but do you have a electronic emergency brake? ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [July 21, 2021, 12:51pm UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152/3 "2021-07-21T12:51:45Z")
Your ABS **should** prevent lockup. This is a serious safety issue. Keep your paperwork, check your state lemon laws. Obviously your dealership is **not** fixing your brakes. You could take it to a different dealership, any Toyota dealership will perform the repair under the warranty. Elevate your complaint to corporate according to instructions in your owners manual. > [@Cw09](#): > > My rear brakes keep locking up, the dealer has fixed it 3 times and the problem has yet to be rectified ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [July 21, 2021, 3:00pm UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152/4 "2021-07-21T15:00:59Z")
+1 to Purbred’s comment. As long as those rear tires still have at least 5/32 " tread remaining, the rear brakes should not be locking up. ---
**Author:** ![shadowfax](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/shadowfax/32/13026_2.png) [@shadowfax](https://community.cartalk.com/u/shadowfax)\ **Post date:** [July 21, 2021, 9:39pm UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152/5 "2021-07-21T21:39:27Z")
A lot of trucks have a load sensing brake proportioning valve that detects weight in the bed and adjusts how hard the rear brakes squeeze. If that load sensor gets stuck in the loaded position, it’ll squeeze the rear brakes too hard, which can cause a rear wheel lockup. That said, I agree with the lemon law complaints. This is a serious issue and they’ve had their chances to fix it. ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [July 21, 2021, 10:51pm UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152/6 "2021-07-21T22:51:44Z")
> [@shadowfax](#): > > A lot of trucks have a load sensing brake proportioning valve that detects weight in the bed and adjusts how hard the rear brakes squeeze. If that load sensor gets stuck in the loaded position, it’ll squeeze the rear brakes too hard, which can cause a rear wheel lockup. That was my first thought but if **I** thought of it I’d think the mechanics at the dealership surely would have? ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [July 21, 2021, 11:39pm UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152/7 "2021-07-21T23:39:30Z")
Since it is under warranty presumably, OP doesn’t have much choice but to keep taking it back to the dealership. It’s possible there’s defective flexible brake hose involved with this. When that happens the hose can act like a one way valve, which can cause the brake to lock. If that’s the problem it is a fairly simple repair, once it is properly diagnosed. ---
**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\ **Post date:** [July 22, 2021, 12:06am UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152/8 "2021-07-22T00:06:15Z")
> [@shadowfax](#): > > A lot of trucks have a load sensing brake proportioning valve that detects weight in the bed and adjusts how hard the rear brakes squeeze. If that load sensor gets stuck in the loaded position, it’ll squeeze the rear brakes too hard, which can cause a rear wheel lockup. > > That said, I agree with the lemon law complaints. This is a serious issue and they’ve had their chances to fix it. I thought those were made obsolete by four wheel ABS. ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [July 22, 2021, 11:52am UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152/9 "2021-07-22T11:52:41Z")
I too was wondering about that. ABS should prevent lockup no matter of cargo weight or lack of weight. ---
**Author:** ![shadowfax](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/shadowfax/32/13026_2.png) [@shadowfax](https://community.cartalk.com/u/shadowfax)\ **Post date:** [July 22, 2021, 12:47pm UTC](https://community.cartalk.com/t/2020-toyota-tacoma-rear-brake-lock-up/178152/10 "2021-07-22T12:47:11Z")
> [@NYBo](#): > > I thought those were made obsolete by four wheel ABS. You’d think, but there are at least some trucks with both. My '05 Tundra has ABS and a load sensing proportioning valve.