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Old 12-06-2023, 10:28 PM #1
SocalSam SocalSam is offline
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2003 4Runner Brake Booster Noise w/Video
My turn for brake booster trouble. 2003 4Runner started making shrieking noise which repeats every 5-10 seconds. Red brake warning light and continuous alarm came on at same time. VSC and ABS lights came on as well. Trouble codes are C1223 and C1252. C1223 is ABS control system malfunction. C1252 is hydo-booster pump motor malfunction. Here is video with audio of noise:

2003 Toyota 4Runner Brake Booster Noise C1223 and C1252 - YouTube

What do you think? Will replacing pump motor solve my problem? Is the 4Runner booster motor found in other Toyota models? Is there deeper problem I need to look for? Thanks in advance!
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Old 12-07-2023, 07:15 AM #2
earthrealm earthrealm is offline
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Quote:
Originally Posted by SocalSam View Post
My turn for brake booster trouble. 2003 4Runner started making shrieking noise which repeats every 5-10 seconds. Red brake warning light and continuous alarm came on at same time. VSC and ABS lights came on as well. Trouble codes are C1223 and C1252. C1223 is ABS control system malfunction. C1252 is hydo-booster pump motor malfunction. Here is video with audio of noise:

2003 Toyota 4Runner Brake Booster Noise C1223 and C1252 - YouTube

What do you think? Will replacing pump motor solve my problem? Is the 4Runner booster motor found in other Toyota models? Is there deeper problem I need to look for? Thanks in advance!
if you dont have a leaking brake fluid issue, then a failed pump is the 2nd best culprit. a used pump runs about 140 bucks while a complete mc-abs unit runs over 500 bucks...your call on which option to go for
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Old 12-07-2023, 08:39 PM #3
SocalSam SocalSam is offline
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Originally Posted by earthrealm View Post
if you dont have a leaking brake fluid issue, then a failed pump is the 2nd best culprit. a used pump runs about 140 bucks while a complete mc-abs unit runs over 500 bucks...your call on which option to go for
Thankfully, no leaks and pump still works so I was able to drive home. Went to NAPA and they say pump is not available separately. 4th gens are not common at the self serve yards but the two I've seen were missing the complete units. (I would have taken them for spares even though mine was working at the time.) I will try Toyota breakers or...gulp...ebay.
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Old 12-09-2023, 09:03 PM #4
SocalSam SocalSam is offline
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Picked a pump motor and accumulator from a 2004 GS300 and installed it. Cleared codes. Problem solved. Still have to do proper bleed. Booster pump is running a little more than it should which I think is air in the system.
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