Question about 1998 Pontiac Bonneville

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1998 Pontiac Bonneville Brake system

I am replacing a rear brake line, from the pump back, and there is a silver cylinder that the line goes into and comes out on located near the fuel tank. There is one on bothe lines....what is it?

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  • crispies Sep 15, 2008

    I'm having a problem with the same part. It's not a part of the fuel line. It's definitely a part of the brake lines running along the drivers side of the vehicle back to the rear wheels. Whatever they are, the ones on my girlfriend's 1992 Bonneville just rotted out and she lost her brake fluid while driving today. I need to replace them, but I am wondering if they are just a coupler, or if they are some kind of pressure regulating coupling. If they're just a coupler, I'll cut them out all together, and run a replacement length of brake line and flare some new fittings on.



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It is a brake proportioning valve. Dealer only part.

1998 Pontiac Bonneville Brake system - 32eba35.jpg

Posted on Sep 17, 2008

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Dude are you sure that is your brake line and not fuel line??

You are describing a fuel line....

If you are sure and it doesn't seem to serve any reasonable purpose, don't worry about it... as long as the brake line you are using is new and in good condition there really isn't anything to worry about.

Keep in mind you can use compression fittings and replace sections of line rather than replacing the entire line....

Posted on Aug 29, 2008

  • Ray Moore May 19, 2011

    Compression lines should never be used for brake lines, Pressure in the line can reach over 1200 psi. Flared fittings are much stronger than flared fittings and may be illegal in some states.

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Posted on Jan 02, 2017

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Dear Brake Line....
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Brake line diagram


Brake Lines and Hoses
Double-walled steel line is used in the hydraulic lines between the brake master cylinder and the front tube connector, and between the brake master cylinder and the flexible brake hose at the rear wheels.
Double-flared brake lines provide good leak-proof connections.
When replacing hydraulic brake lines, hoses, or connectors, tighten all connections securely. After replacement, bleed the brake system; refer to Section 206-00 .
The wet appearance of the outer cover of the rubber brake hose is referred to as "sweating." This is a normal condition for neoprene rayon braid hose and is not a sign of leakage or cause for replacement of the hose.

Hydraulic Brake System Components — Non-ABS

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Item Part Number Description 1 2005 Power Brake Booster 2 2455 Brake Pedal 3 2261 Rear Wheel Cylinder 4 2552 Rear Disc Brake Caliper— (Mexico Only) 5 2B120 Disc Brake Caliper—, Front 6 2B091 Brake Pressure Control Valves 7 2140 Brake Master Cylinder

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