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AirCooledClassics
Samba Member
Joined: August 20, 2004
Posts: 294
Location: Saskatoon, Sk Canada
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 Posted: Tue Aug 14, 2018 7:12 pm Post subject: Dragging brakes. |
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I just installed a new brake booster and master cyl into a 74 westy and am suffering non releasing brake occasionally. It finally happened nere a jack and I found front and rear locked up. I checked the free play{good) then loosed the 13mm holding the M/cyl and the brakes freed up with just a couple of twists. Is it possible the rod in the booster is too long? The brake are to dam good
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busdaddy
Samba Member
Joined: February 12, 2004
Posts: 51153
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Tue Aug 14, 2018 7:17 pm Post subject: Re: Dragging brakes. |
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There are usually shim washers under the pressed in tip of the booster rod, some MC's require removing one or all. Worst case scenario shorten the rod slightly with a file or add some thick gaskets between the MC and booster.
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SGKent 
Samba Member
Joined: October 30, 2007
Posts: 41031
Location: Citrus Heights CA (Near Sacramento)
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| Posted: Tue Aug 14, 2018 7:37 pm Post subject: Re: Dragging brakes. |
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also some 1971 and later models have an adjustment on the rod that pushes from the pedal. Changing the master can require a check there. See Bentley Master Cylinder where it explains how to adjust the servo and master to work together. pages 5 and 6 in my Bentley Brakes and Wheels. Those systems are adjusted at the clevis because the pushrod is a solid part.
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Last edited by SGKent on Tue Aug 14, 2018 7:39 pm; edited 1 time in total |
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aeromech
Samba Member
Joined: January 24, 2006
Posts: 16971
Location: San Diego, California
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| Posted: Tue Aug 14, 2018 7:38 pm Post subject: Re: Dragging brakes. |
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If you just installed a new aftermarket booster you probably didn’t adjust the rod
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AirCooledClassics
Samba Member
Joined: August 20, 2004
Posts: 294
Location: Saskatoon, Sk Canada
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TomWesty
Samba Member
Joined: November 23, 2007
Posts: 3482
Location: Wyoming,USA
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| Posted: Tue Aug 14, 2018 9:27 pm Post subject: Re: Dragging brakes. |
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If you used one of the new Airtec servos like I did, I measured how much the rod protruded from the face of the servo on the original and then adjusted the one on the Airtec to match it. Mine has worked well for a year now.
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