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View Full Version : Silicone Brake Booster Hose?



RallyeBourne
09-02-2014, 07:16 PM
1999 A4 AEB Quattro 5spd

The check valve going to the brake booster in my car is bad. Leaks boost like crazy, previous owner attempted to silicone it shut...
http://tapatalk.imageshack.com/v2/14/09/02/2b12e5a36e40abd3f9cbafb88f2d7048.jpg
Yeah.

So I have a replacement check valve, but it seems impossible to remove the plastic hose without breaking it. So my question is, can I use silicone to replace it? I have tons of silicone hose laying around, and I cannot find that damn brake booster hose to save my life.

If I can't use silicone, can someone point me to the direction of obtaining a new replacement? I've scoured ETKA for hours trying to find it, and came up empty handed.

Gracias.

RallyeBourne
09-02-2014, 07:19 PM
http://tapatalk.imageshack.com/v2/14/09/02/e26ba40e3fd337f48a82006d6931076f.jpg

Previous picture turned out like crap.

GrapeBandit
09-02-2014, 07:26 PM
silicone hose w/no check valve? bad idea unless you want it to see boost

BaseDrifter
09-02-2014, 07:34 PM
^No, I'm pretty sure he means using his new check valve but siliconing the hose if it breaks when removing it. That may work…but I wouldn't really trust it, not for something like the brake booster vac hose.

You could get that hose from a junkyard, or ECS has them for ~$60, should be part number 8D1 611 931BA. There's a split in 99 so check your VIN.

RallyeBourne
09-02-2014, 07:34 PM
No, I have a replacement check valve. Just can't find the damn hose.

GrapeBandit
09-02-2014, 07:52 PM
ohh. my bad...read it too fast. dont think a silicone would be a good idea, it would expand under the pressure, thats the reason stock is a hard line

RallyeBourne
09-02-2014, 08:25 PM
Correct me if I'm wrong, but the brake booster operates using vacuum, not pressure. The check valve keeps the pressure out of the hose.

GrapeBandit
09-02-2014, 08:30 PM
^you are correct. so lmk how that silicone hose works out then. [up]

MetalMan
09-03-2014, 07:13 AM
Silicone should be okay, but is it reinforced silicone hose? Regular silicone hose may work too. Here you go on the replacement part:
http://www.ecstuning.com/Audi-B5_A4-quattro-1.8T/Engine/Intake/Valves/Check/ES2672200/

GrapeBandit
09-03-2014, 09:19 AM
$4, this cant be right. lol
http://www.hansautoparts.com/8D1611931BVacuumCheckValve.aspx

RallyeBourne
09-03-2014, 10:56 PM
It's not. There's no elbow in mine.

(Well, there is, but that's after the check valve going into the I/m, it's not part of that hose).

GrapeBandit
09-03-2014, 11:05 PM
It's not. There's no elbow in mine.

(Well, there is, but that's after the check valve going into the I/m, it's not part of that hose).
i was talking about the price. its listed for your car, pic may be off though. some places use generic pics ya know

MetalMan
09-04-2014, 07:44 AM
Was my link the right one? Should be... but they don't sell the hose (Genuine Audi part, anyways) without the check valve.

RallyeBourne
09-04-2014, 07:46 AM
Was my link the right one? Should be... but they don't sell the hose (Genuine Audi part, anyways) without the check valve.
Yes sir. As always, you come through, lol. I still owe you a beer, btw.

I think I'm going to try the silicone first (in hopes to save $60), and see if I have issues.

redline380
09-04-2014, 07:56 AM
I've been using some random-ass hose for 10k miles now and no ill effects. When I swapped in my built motor, I did all the emissions deletes. Out of all the random hoses I removed, I picked one out and hooked it up, using the check valve of course. It isn't silicone, but the stock rubber.

MetalMan
09-04-2014, 08:17 AM
Yes sir. As always, you come through, lol. I still owe you a beer, btw.

I think I'm going to try the silicone first (in hopes to save $60), and see if I have issues.

The silicone ought to be fine, methinks. Especially if it can save you $60!

RallyeBourne
09-04-2014, 04:19 PM
Done. So far, so good. I guess I couldn't realize just how bad the brakes were. They are a lot firmer now.

As far as the boost leak part of it, I didn't gain any pressure, but I'm spooling a little faster. So the car feels more responsive.