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MGB What is this?

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Carlbanan56

Carlbanan56

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I have wondered
IMG_0851.JPEG
for some time what this is, the silver thing in the back of the motor bay. I appreciate all your wisdom
 
Yikes - quite a collection of different paints and disconnected lines in there. I'm guessing you have a vacuum release (?), as the silver disk seems to connect with a brake booster.

Is this your car?
 
Yes its my car and I am currently in the process of removing the cylinder head. So most of the lose hoses and are supposed to be connected to the carburetors. I was wondering what the purpose of black hoes is, the lose end connects to the intake masilfold. I am not sure if I have vacuum release, what is that?

Thanks for your patience
NutmegCT said:
Yikes - quite a collection of different paints and disconnected lines in there. I'm guessing you have a vacuum release (?), as the silver disk seems to connect with a brake booster.

Is this your car?
Click to expand...
 
OK - if you mean the black hose with the woven cover (and the circular clamp), it supplies vacuum from the manifold to the brake booster.

I'm just guessing on the "vacuum release", as it appears to be connected to the booster, and has brake lines coming from it. What looks like a small button in the center of the silver disk, may release vacuum so the brakes will release if the booster gets stuck.

Hope this helps!
Tom M.
 
NutmegCT said:
Yikes - quite a collection of different paints and disconnected lines in there. I'm guessing you have a vacuum release (?), as the silver disk seems to connect with a brake booster.

Is this your car?
Click to expand...

I'm not sure its a brake booster, simply because the picture seems to be showing a right hand drive car (there is no steering column coming out beneath the mystery components). It looks almost like a vapor recovery unit of some kind to me.
 
YakkoWarner said:
I'm not sure its a brake booster, simply because the picture seems to be showing a right hand drive car (there is no steering column coming out beneath the mystery components). It looks almost like a vapor recovery unit of some kind to me.
Click to expand...
Yeah, but those do look very much like brake lines attached to it. Some sort of remote brake booster?
 
Big item with vacuum hose and brake pipes is a remote brake servo for single line system. Most people are accustomed to seeing the servo fitted to the master cylinder.
MGCs used two remote brake servos.
 
Grantura_MKI said:
Big item with vacuum hose and brake pipes is a remote brake servo for single line system. Most people are accustomed to seeing the servo fitted to the master cylinder.
MGCs used two remote brake servos.
Click to expand...

Hmmm...learn something new every day. I wasn't even aware that you COULD do a brake servo that is mechanically separated from the actual brake pedal linkage. I'll admit to being curious as to how this works.
 
YakkoWarner said:
Hmmm...learn something new every day. I wasn't even aware that you COULD do a brake servo that is mechanically separated from the actual brake pedal linkage. I'll admit to being curious as to how this works.
Click to expand...
It's attached hydraulically.

When a brake servo is fitted to the Austin-Healey 3000, a normal master cylinder is still attached to the pedal box / brake pedal. The servo is mounted behind the the right front wheel well.

Later MGBs have what you're used to - the servo is attached to the firewall and the master cylinder is attached to the front of the servo.
 
BobHaskell said:
It's attached hydraulically.

When a brake servo is fitted to the Austin-Healey 3000, a normal master cylinder is still attached to the pedal box / brake pedal. The servo is mounted behind the the right front wheel well.

Later MGBs have what you're used to - the servo is attached to the firewall and the master cylinder is attached to the front of the servo.
Click to expand...

That is what I have always seen - I had never encountered an earlier one with a servo at all, always just assumed they were unassisted since all 3 of the earlier ones I owned were that way.
 
None of the earlier MGBs had a booster fitted as standard equipment by the factory. They were available aftermarket....some may have been dealer installed. I don't *think* they were available from the factory as optional equipment, but I could be wrong....
 
I suspect this MGB is a 1968-74 MKII, as MKIs had the steering column hole punched out in the bulkhead. As stated above, this was a popular option at the time. It provided a softer pedal for stopping.
 
Not MG but Vauxhall - my servos

1723685633057.png


and also here

1723685678791.png
 
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