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Deen Rechner
Samba Member
Joined: August 28, 2016
Posts: 72
Location: at home
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 Posted: Sat Oct 08, 2022 4:28 am Post subject: Disc brake with brake booster |
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Has anyone installed disc brakes with brake boosters in his bus?
The mounting plate for the brake booster on the VW T1 front axle, where did you mount the plate?
Have sonemone a template for this? or a picture? |
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Split 66'
Samba Member
Joined: October 07, 2010
Posts: 1378
Location: Bay Area, California
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| Posted: Sat Oct 08, 2022 10:46 am Post subject: Re: Disc brake with brake booster |
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I've had disc brakes up front for almost 8 years now, with a late-bus German dual circuit master cylinder. I've never once felt like I need more pedal pressure, or a booster, plenty of braking power without it.
If you're set on using a booster, you could use a late-Bus ball joint beam, it has provision for the booster built in.
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brettsvw
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Joined: November 22, 2007
Posts: 2172
Location: Florida
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3foldfolly
Samba Member
Joined: March 08, 2009
Posts: 894
Location: Edwardsville, Il
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| Posted: Wed Oct 19, 2022 6:21 pm Post subject: Re: Disc brake with brake booster |
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| Split 66' wrote: |
I've had disc brakes up front for almost 8 years now, with a late-bus German dual circuit master cylinder. I've never once felt like I need more pedal pressure, or a booster, plenty of braking power without it.
If you're set on using a booster, you could use a late-Bus ball joint beam, it has provision for the booster built in. |
1970 and later bay buses have a wider 4 bolt pattern at each end where they attach to the frame rails and are not a direct bolt in fit like the 68-69 bay bus front beams are. |
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Split 66'
Samba Member
Joined: October 07, 2010
Posts: 1378
Location: Bay Area, California
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| Posted: Thu Oct 20, 2022 11:30 am Post subject: Re: Disc brake with brake booster |
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| 3foldfolly wrote: |
| Split 66' wrote: |
I've had disc brakes up front for almost 8 years now, with a late-bus German dual circuit master cylinder. I've never once felt like I need more pedal pressure, or a booster, plenty of braking power without it.
If you're set on using a booster, you could use a late-Bus ball joint beam, it has provision for the booster built in. |
1970 and later bay buses have a wider 4 bolt pattern at each end where they attach to the frame rails and are not a direct bolt in fit like the 68-69 bay bus front beams are. |
Good to know about the late Bus beam differences, thanks.
| Deen Rechner wrote: |
| Have sonemone a template for this? or a picture? |
The OP was looking for an example, or template for how to mount a booster, I had meant to take a look at the later Bus beam design pictures, to get an idea of how and where to mount the booster.
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brettsvw
Samba Member
Joined: November 22, 2007
Posts: 2172
Location: Florida
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| Posted: Thu Oct 20, 2022 11:40 am Post subject: Re: Disc brake with brake booster |
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| Split 66' wrote: |
| 3foldfolly wrote: |
| Split 66' wrote: |
I've had disc brakes up front for almost 8 years now, with a late-bus German dual circuit master cylinder. I've never once felt like I need more pedal pressure, or a booster, plenty of braking power without it.
If you're set on using a booster, you could use a late-Bus ball joint beam, it has provision for the booster built in. |
1970 and later bay buses have a wider 4 bolt pattern at each end where they attach to the frame rails and are not a direct bolt in fit like the 68-69 bay bus front beams are. |
Good to know about the late Bus beam differences, thanks.
| Deen Rechner wrote: |
| Have sonemone a template for this? or a picture? |
The OP was looking for an example, or template for how to mount a booster, I had meant to take a look at the later Bus beam design pictures, to get an idea of how and where to mount the booster. |
I cut the booster bracket from a late beam to weld to my beam.
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Split 66'
Samba Member
Joined: October 07, 2010
Posts: 1378
Location: Bay Area, California
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| Posted: Thu Oct 20, 2022 2:02 pm Post subject: Re: Disc brake with brake booster |
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Nicely done on the mount.
I was reading long ago that a 1600cc or less, has some difficulty making enough vacuum pressure under braking conditions -or when the motor is at idle- to allow full operation of the booster.
Did you experience any issues like that? Where did you connect your vacuum line to?
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brettsvw
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Joined: November 22, 2007
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Location: Florida
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Alan Brase
Samba Member
Joined: March 28, 2004
Posts: 4570
Location: Cedar Falls, Iowa
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| Posted: Sun Oct 23, 2022 11:55 am Post subject: Re: Disc brake with brake booster |
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| Split 66' wrote: |
Nicely done on the mount.
I was reading long ago that a 1600cc or less, has some difficulty making enough vacuum pressure under braking conditions -or when the motor is at idle- to allow full operation of the booster.
Did you experience any issues like that? Where did you connect your vacuum line to? |
1971 buses dual port had a special intake manifold with the big 10-12mm nipple. One could use a Autostick manifold to conver a 15-1600 single port. or make your own tapping under the carb.
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Al Brase
Projects: 67 sunroof bug, 67 Porsche 912 Targa, 70 Westy
Dec 1955 Single Cab pickup WANT 15" BUS RIMS dated 8/55, thru 12/55
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kreemoweet
Samba Member
Joined: March 13, 2008
Posts: 4122
Location: Seattle, WA
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| Posted: Tue Oct 25, 2022 8:32 pm Post subject: Re: Disc brake with brake booster |
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| Split 66' wrote: |
| I was reading long ago that a 1600cc or less, has some difficulty making enough vacuum pressure under braking conditions -or when the motor is at idle- to allow full operation of the booster. |
Not true. The booster already has vacuum in it before you step on the brakes, and it's enough to operate the brakes more than once.
It's actually the atmospheric pressure on the booster diaphragm that
gives the braking force boost. If you run short of atmospheric pressure, bad brakes is the least of your worries.
Also, manifold vacuum is greatest at idle.
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Lind
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Joined: November 06, 2000
Posts: 10258
Location: idaho
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| Posted: Tue Oct 25, 2022 9:05 pm Post subject: Re: Disc brake with brake booster |
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The booster is nice. I like the feel on a '71 bus. VW made and sold buses with every configuration. I have a 1970 bus with a booster for drum brakes. I had a 1979 bus with disc brakes and no booster.
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Split 66'
Samba Member
Joined: October 07, 2010
Posts: 1378
Location: Bay Area, California
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| Posted: Tue Oct 25, 2022 11:33 pm Post subject: Re: Disc brake with brake booster |
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I have the 4-piston Wilwood discs up front, with a late-Bus DCMC, feels like this even without a booster:
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