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dentfreeimage
Samba Member
Joined: September 21, 2013
Posts: 292
Location: San Antonio, TX
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 Posted: Thu Jan 18, 2018 11:11 pm Post subject: Parking Brake Clip, Do I need it? |
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Hello everyone, I am rebuilding the brakes on my 71 camper and I removed one clip from each side on the rear. These clips were at the end of the parking brake cable spring against the backing plate on the inside.
I am asking because one clip broke and I will have to replace it or remove the good clip if they are not needed. I looked online for a replacement and I can not find one. I was told by one person it was not needed, I am just making sure.
Thank you for the help.
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Abscate
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Joined: October 05, 2014
Posts: 22668
Location: NYC/Upstate/ROW
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| Posted: Fri Jan 19, 2018 6:42 am Post subject: Re: Parking Brake Clip, Do I need it? |
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Split a washer and make a replacement - I doubt they had it on for fun.
You can probably clip a washer with a good pair of snips or a minute with a hacksaw. Bend it to put it on, then bend it back flat to secure it (and it won't get lost again!)
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hazetguy
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Joined: April 06, 2001
Posts: 10773
Location: iT StiNgeD iTseLf tO dEAd
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| Posted: Fri Jan 19, 2018 9:03 am Post subject: Re: Parking Brake Clip, Do I need it? |
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"I was told by one person it was not needed.. " get your mechanical advice from someone else.
they hold the cable assembly to the backing plate, allows the spring to have something to seat on, so you decide if they are important or not.
i've used the "horseshoe" clips that are also used for the e-brake arm pin. I crimp them slightly so that they are not tight on the cable and the spring holds them in place.
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kreemoweet
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Joined: March 13, 2008
Posts: 3899
Location: Seattle, WA
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| Posted: Fri Jan 19, 2018 3:38 pm Post subject: Re: Parking Brake Clip, Do I need it? |
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| hazetguy wrote: |
| they hold the cable assembly to the backing plate, allows the spring to have something to seat on |
On the '71 (and later) p.b. cables and backing plates I've had, they would do no such thing. There were some clips on earlier/different VW
vehicles that bolted to the plate and actually did hold the cable outer sheath in place. On '71 and later cables, there is only the solid cable end that
goes thru the plate, and it is solidly held in place without any extraneous clips. The spring on the cable seats just fine on the cable end, again with
no need of any additional clips.
The VW parts manual for 68-up bay busses shows no such part. Perhaps at one time the clips were an integral part of the parking brake cable assemblies,
(which would be odd, since they'd need to be removed to install the cables). They certainly have not been on any '71 or 72-79 bus cables I've had. I would
guess that the clips people sometimes find on 71-up busses have been installed by PO's who've been misled by some erroneous Bentley info.
The clips are indeed shown on the Figure 8-1, Brakes and Wheels chapter, Bentley 68-79 Type II manual, but I take that as yet another error in that work.
There's more daffiness in the Bentley about parking brake stuff at section 10.3 in the same chapter, where it discusses non-existent bolts and brackets
that hold the cable in the backing plate.
I note also that the OP's photo shows a backing plate quite different from the stock 71 items my bus used to have. Is it really a stock '71 brake setup?
If someone would care to explain exactly how those clips could do anything except possibly interfere with the normal cable action, I am all ears.
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busdaddy
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Joined: February 12, 2004
Posts: 51144
Location: Surrey B.C. Canada, but thinking of Ukraine
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| Posted: Fri Jan 19, 2018 5:04 pm Post subject: Re: Parking Brake Clip, Do I need it? |
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Well I guess it might help the cable assy. stay in the backing plate, but the way they fit and are held under compression between the torsion housing and plates I have yet to see one even close to coming out.
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dentfreeimage
Samba Member
Joined: September 21, 2013
Posts: 292
Location: San Antonio, TX
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| Posted: Fri Jan 19, 2018 6:57 pm Post subject: Re: Parking Brake Clip, Do I need it? |
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| Thank you guys for the help. I will add a washer to the missing side. |
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sjbartnik
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Joined: September 01, 2011
Posts: 5998
Location: Brooklyn
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| Posted: Fri Jan 19, 2018 8:37 pm Post subject: Re: Parking Brake Clip, Do I need it? |
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| dentfreeimage wrote: |
I was told by one person it was not needed, I am just making sure.
Thank you for the help.
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Oh man this smart guy should have worked for VW! Imagine how much money he could have saved them if he just told them it wasn't needed!
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raygreenwood
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Joined: November 24, 2008
Posts: 21518
Location: Oklahoma City
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| Posted: Sat Jan 20, 2018 11:35 am Post subject: Re: Parking Brake Clip, Do I need it? |
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| hazetguy wrote: |
"I was told by one person it was not needed.. " get your mechanical advice from someone else.
they hold the cable assembly to the backing plate, allows the spring to have something to seat on, so you decide if they are important or not.
i've used the "horseshoe" clips that are also used for the e-brake arm pin. I crimp them slightly so that they are not tight on the cable and the spring holds them in place. |
This is correct.
The function of that clip/plate is as a spring seat. The E-brake cable is in effect...a bowden tube. As you cinch the brake tight the cable tube flexes and changes angle. You also get some angle change as the suspension trailing arm moves. Unlike a clutch bowden tube with a bracket at the end to hold the outer sheath at the proper angle so that the cable does not wear on the tube edge and you get proper operation.
The spring on the E-brake cable is allowed to move and change angle. Having an outer tube sheath that fit inside of the spring would deform and wear the spring as the tube changed angle to the spring.
Likewise having a cup shaped ferrule on the end of the sheath tube for the spring to fit into would wear on the inside of the cup and spring....so the quicky answer is to have what is basically a washer as a move-able spring seat in this position.
In general...not always...but in general...do not second guess the engineering of the brake and suspension systems. Ray |
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