How do you tighten the parking brake on a van? I have a 77 westy van and the parking brake is weak to say it best...

I know on the beetle there are simple nuts to tighten the brake... but don't see anything like it on the van...

any words of advice?

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1977 Westfalia Campmobile

New paint, new exhaust system, replacement H4 headlight conversion, new tail light assemblies, JVC CD player, Infinity 6.25 and pioneer 6x9's...