# “Check Brake System” comes on after repair on 2011 Lincoln MKZ hybrid, 67K Miles. 

**URL:** <https://community.cartalk.com/t/check-brake-system-comes-on-after-repair-on-2011-lincoln-mkz-hybrid-67k-miles/137690>\
**Category:** Maintenance/Repairs\
**Created:** [April 1, 2019, 3:11am UTC](https://community.cartalk.com/t/check-brake-system-comes-on-after-repair-on-2011-lincoln-mkz-hybrid-67k-miles/137690 "2019-04-01T03:11:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kellidav5\_150233](https://avatars.discourse-cdn.com/v4/letter/k/b5a626/32.png) [@kellidav5\_150233](https://community.cartalk.com/u/kellidav5_150233)\
**Post date:** [April 1, 2019, 3:11am UTC](https://community.cartalk.com/t/check-brake-system-comes-on-after-repair-on-2011-lincoln-mkz-hybrid-67k-miles/137690/1 "2019-04-01T03:11:21Z")

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The “Check Brake System” comes on intermittently for the past several months. Dealer replaced the brake control, module, and hose for $3,000 (diagnostic code on invoice was B1634). Three weeks later, “Check Brake System” light is came on again (before the fix, I had gone up to a week between light coming on).  
I take it back, they do the diagnosis and say it is due to a completely distinct issue - now I need to replace the brake vacuum/booster (code C1015:64). It’s strange I am having multiple parts fail all giving “check brake system” over a short span of time on a car with only 67k miles. I question if the root cause of my car’s problem has actually been identified . Are the codes a reliable way to diagnosis my car’s problem? Is there something that could be failing/malfunctioning that would create issues in these different brake system parts? Or is it really just bad luck? I have noticed no difference in how my car drives.  
Thank you for any insight you can provide,  
Kelli

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [April 1, 2019, 12:16pm UTC](https://community.cartalk.com/t/check-brake-system-comes-on-after-repair-on-2011-lincoln-mkz-hybrid-67k-miles/137690/2 "2019-04-01T12:16:30Z")

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Ok, the first trouble code B1634 is a body error telling the right mirror adjustment motor is bad, not a brake code. A brake code would be a C code. The C1015:64 is a vacuum supply problem. Faulty vacuum sensor or vacuum pump. I would think replacing the sensor, not the booster would be the solution.

Error codes are a guide in a diagnostic troubleshooting process, NOT, a “replace this part” instruction. So, no, the dealer has not found the core problem(s). I think you should have the service writer, or the service manager explain why you paid $3000 for a mirror code and why they think swapping the booster will fix a sensor problem. The answer or lack of one will determine if you should change dealers.

I suspect they are guessing and changing parts rather than actually diagnosing the problem(s). The flip side is a hybrid is a complicated car that is expensive to repair.