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> Strange Brake Valve
post Aug 2 2010, 09:44 AM
Post #1


Group: Members
Posts: 2
Joined: 2-August 10
Member No.: 76,363
Status: Offline
Location: SE Finland
Drives: Volvo 142

Hi there!

I wonder if any of you can help me. There is this strange brake reduction valve in Volvo 140s, P 1800 and later Amazon 120, situated in front of the rear axle. The local Volvo dealer here doesn't know it, the Swedish pros at KG Trimning can't find it anywhere, and a Google search ain't giving no results. I've found drawings of it here: http://volvo1800pictures.com/document/verk...5_bromsar_2.pdf , pictures (bild) 45, 46 and 47.
Do any of you know where to find one, or know of a Volvo part dealer who sells on the Internet, and might have one for sale?

Thanks a lot in advance;
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post Jun 15 2011, 10:54 PM
Post #2


Group: Members
Posts: 2
Joined: 15-June 11
Member No.: 90,904
Status: Offline
Location: US
Drives: 2004 Volvo

I have 30 years of experience in maintenance and vehicle repair and have worked at several garages and I can tell you this: incompetance is rampant.
You said you were "losing pedal pressure". Did the pedal slowly go down while pressing on it? This is called pedal fade and is due to only two reasons: a leak in the system and a wornout master cylinder. Unless you had a wheel soaked in brake fluid, you had a bad master cylinder to start with. That would also account for no pressure in the rear wheel. When they installed the new master cylinder did they "bench bleed" it before attaching the lines? Air in the master cylinder will stop any attempt to bleed the lines. A master cylinder MUST be bled and have a constant flow of new brake fluid so it doesn't go dry, which makes you start all over. I suspect that it may be one thing to look at.
Next I would be sure that the wheel cylinder bleeder screw is not plugged by rust or dirt. They need to be removed and cleaned out and blown out with compressed air. It doesn't take much to plug up the bleed holes at the bottom of the bleeder screw.
The bottom line is that there is air or a solid blockage in the lines. I found out through experience that vacuum bleeding works very well. I use a vacuum pump called a "Mighty Vac".
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post Jun 16 2011, 01:13 AM
Post #3


Group: Members
Posts: 59
Joined: 2-June 11
Member No.: 90,275
Status: Offline
Location: USA
Drives: Volvo V40

Just to point out that I thought I ordered. There have been a breath of air between the pump and the valve bias. Bled this morning and now its fine.
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