Front passenger wheel locked up

Tiny
MARKRLR300
  • MEMBER
  • 2004 HYUNDAI ELANTRA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 85,000 MILES
Hello everyone, I have the car listed above GLS model with ABS brake system.
The car is in really good condition for its age, no rust underneath. The
problem is the right front passenger wheel was locked up when I went to
leave. I replaced the caliper and the flexible brake hose. I inspected all brake
lines going to?ABS and then to master cylinder, all good. All other wheels turn
freely. Here is the kicker: I take off the master cylinder cap and can press the
caliper on the drivers side easily and fluid returns to reservoir, when I try to
compress the caliper on the passenger side, it does not move, no fluid is
going back to the master cylinder. I can only release the cylinder with the
bleeder. I apply the brake again and drivers side spins, the passenger side is
locked up. What would cause the fluid not to go back to master cylinder?
Thanks
Monday, July 23rd, 2018 AT 1:44 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi and thanks for using 2CarPros.com.

What you described is the exact symptom of a bad rubber brake hose. However, you replaced it. What I would suggest is to remove it again and see if you are able to blow compressed air through it both ways. Something is telling me that there is a problem with the new hose as well.

Here are general directions for caliper replacement:

https://www.2carpros.com/articles/brake-caliper-replacement

Here are the directions for replacement from alldata specific to hose replacement. I've attached exploded views of the caliper and its components for you to review and make sure all it together correctly. However, it sounds like you got it right, but there is an issue with that hose. Here are the directions for hose replacement. Also, starting with picture 4, the pics will correlate with the directions.

BRAKE LINE REPLACEMENT

NOTE:
Before reassembling, check that all parts are free of dust and other foreign particles.
Replace parts with new ones whenever specified to do so.
Do not spill brake fluid on the vehicle; it may damage the paint; If brake fluid gets on the paint, wash it off immediately with water.

1. Replace the brake hose (A) if the hose is twisted, cracked, or if it leaks.
2. Disconnect the brake hose from the brake line (B) using a 10 mm flare-nut wrench (C)

3. Remove and discard the brake hose clip (A) from the brake hose (B).
4. Remove the connector bolt (c), and disconnect the brake hose from the caliper. 5. Remove the brake hose from the knuckle.

6. Install the brake hose (A) on the knuckle with 12mm flange bolt (B) first, then connect the brake hose to the caliper with the connector bolt (C) and new sealing washers (D).
7. Install the brake hose (A) on the upper brake hose bracket (B) with a new brake hose clip (C).
8. Connect the brake line (D) to the brake hose
9. After installing the brake hose, bleed the brake system.
10. Perform the following checks.
Check the brake hose and line joint for leaks, and tighten if necessary.
Check the brake hoses for interference and twisting.

Make sure nothing is pinched, twisted or kinked, and let me know what you find. I hope this helps.

Take care,
Joe
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Thursday, February 25th, 2021 AT 11:11 AM
Tiny
MARKRLR300
  • MEMBER
  • 12 POSTS
Thanks Joe for your fast response. I took the new hose off and air passed through both ways uninterrupted, I also reinstalled and pumped up the brake and released the pressure from where the flex hose is connected to the break line located in the wheel well that is routed down from the ABS system. Fluid came out smoothly. Wanted to add that the ABS light was never on until I took out the fuse.
It seems the ABS system is not allowing the brake fluid to flow back if that makes any sense, but just for that one wheel. Do you have any other test I can run or suggestions? Thanks again, Mark
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Thursday, February 25th, 2021 AT 11:11 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi Mark:
Honestly, the ABS does the opposite. It is designed to release pressure to the brakes, so it does not make sense. Please keep in mind, when you checked to see if the fluid came through the hose, that is normal. However, when you release the brakes, there should be somewhat of a low pressure/vacuum from the hose. Did the original caliper function the same? (You had to open the bleeder to release pressure)?
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Thursday, February 25th, 2021 AT 11:11 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi Mark. I was just discussing your brake problem with a tech I work with. He said the same thing I did. However, through our conversation, we thought of a few other things.

What I need you to try is this. When the wheel is locked up, first loosen the steel brake hose at the proportioning valve. Does that make it release? If so, tighten that line and move to the master cylinder (MC). Pump the brakes so that wheel locks and release the brakes. Open the lines at the MC. Does that release the wheel? If it does, I suspect the MC could be the issue and not fully returning and allowing the fluid to return. However, the proportioning valve is suspect at this time. If it releases at the proportioning valve and not the MC, that is the issue.

Let me know what you find.

Take care,
Joe
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Thursday, February 25th, 2021 AT 11:11 AM
Tiny
MARKRLR300
  • MEMBER
  • 12 POSTS
Hey Joe, just got your message. I will get back to you with results. Thanks!
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Thursday, February 25th, 2021 AT 11:11 AM
Tiny
MARKRLR300
  • MEMBER
  • 12 POSTS
Okay Joe, as you can see in pictures there are two lines coming off the master cylinder. Both going directly to the ABS control. One is marked MOP and is tagged green, the other is marked MOS and is tagged yellow. The line tagged red goes to the front passenger side caliper. I loosened the two coming off the master cylinder just enough to see if it would release. Top line no fluid or air, bottom line just a little fluid. The proportioning valve has me stumped, is it part of the master cylinder or the top of ABS? Talk to you later, Mark
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Thursday, February 25th, 2021 AT 11:11 AM
Tiny
MARKRLR300
  • MEMBER
  • 12 POSTS
On top of the ABS unit, I have fluid and pressure coming out of line tagged red going to caliper on front passenger side. I cracked open the lines tagged blue and yellow that go back to the master cylinder and not a drop. I think I hear the fat lady warming up! Thanks, Mark
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Thursday, February 25th, 2021 AT 11:11 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Mark, it sounds like you are getting it. Let me know what you find.
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Thursday, February 25th, 2021 AT 11:11 AM

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