1990 Chevrolet Silverado Combination valve

Tiny
JOE1953
  • MEMBER
  • 1990 CHEVROLET SILVERADO
  • V8
  • 4WD
  • MANUAL
  • 224,000 MILES
I am trying to replace a Combination valve but I can't loosen the Steel lines seem like they are frozen what can I use to loosen the Steel lines?
Tuesday, March 4th, 2014 AT 8:53 PM

5 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Penetrating oil or some low heat carefully
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Thursday, March 6th, 2014 AT 5:52 AM
Tiny
JOE1953
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  • 619 POSTS
I did get the lines loosen by using penetrating oil and a hammer and I replace the combination valve I need to know how do I bleed the combination valve?
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Thursday, March 6th, 2014 AT 9:14 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The best way is to bleed it at the bottom of valve if your brake light comes on it may not be centered but try gravity bleeding first with both or all bottom ones open or cracked loose. If it comes worse to worse you'll have ot bleed the whole system in normal way unless this has anti lock brakes.
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Thursday, March 6th, 2014 AT 9:26 AM
Tiny
JOE1953
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  • 619 POSTS
How do I know when the gravity bleeding is finish? What do you mean about if it comes worse to worse?
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Saturday, March 8th, 2014 AT 6:15 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It means if you don't get eh system bled correctly you'll have to bleed the whole system. When gravity bleed is done it should just be fluid. Actually just rent a power bleeder and do th whole system
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Sunday, March 9th, 2014 AT 8:10 AM

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