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CSP Disc Brake Conversion
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Big Red Love
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PostPosted: Tue Aug 20, 2013 1:49 pm    Post subject: CSP Disc Brake Conversion Reply with quote

I have been contemplating doing this conversion for quite some time, bit the bullet, arrived today. Kit #C31-499-181-5205 for solid 14" wheels. Looks great. Cant wait to get started!

Questions as follows:
I just last year replaced my dual circuit m/c with a good German stock replacement. The instructions that came with the kit recommended I replace the m/c. However the instructions seem to be a little general (cookie cut), and they speak of m/c replacement for 55-67 buses. No mention of the 181. Do I need to replace my master cylinder again with the part # specified by CSP? #611 021 211AA

I know there are some of you out there that have already done this conversion and I was hoping someone took some good pics in process?
I did find a good pic of the completed job recently in "What did you do to your Thing today" but I would really like some pics before the rotor assembly is installed for reference.

Are there any pointers, tricks, cautions that I should be aware of before starting?

Thanks
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locky
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PostPosted: Thu Aug 22, 2013 4:59 am    Post subject: Reply with quote

I don't have the CSP discs but do have the AC Industries. I went with the same M/C and haven't had any problems at all. Those CSP's look really nice. Installation is straight forward. You are going to love them.
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seilerj
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PostPosted: Wed Jan 29, 2014 11:47 am    Post subject: Reply with quote

Well what did you end up doing??

I recently bought the CSP kit and will be doing the conversion sometime during my build up (still a work in progress) Some instructions that I read indicated that I needed either a new master cylinder designed for disc brakes or I can remove the residual pressure valve.

How easy is it to remove the residual pressure valve??(I'm assuming only for fronts, back will stay drums)

Are there kits to rebuild an existing master cylinder?? Or are you better off just buying a new quality master cylinder designed for disc brakes ?
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wbrown45
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PostPosted: Sat Feb 01, 2014 9:29 am    Post subject: Reply with quote

If they are using stock VW calipers, or even calipers about the same size (pistons, etc.) you do not need a new master cylinder, or even a proportioning valve. The stock Ghia master was the same as a std. bug when they started using disc brakes, until the end of their production. I have 4-wheel disc brakes on my Baja with VW calipers, and I have a stock, unmodified German master, and no additional proportioning valve. It has been working extremely well for over 19 years.
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HMVWNAB
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PostPosted: Wed Feb 28, 2018 8:42 am    Post subject: Re: CSP Disc Brake Conversion Reply with quote

How long does this kit typically remain out of stock? Iíve checked the website for awhile and never seems to be available.
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HMVWNAB
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PostPosted: Tue Mar 06, 2018 6:57 am    Post subject: Re: CSP Disc Brake Conversion Reply with quote

I see the kit is back in stock now.

In the meantime I was reading the forums and now am wondering if it is worth the roughly $1000 price difference from the AC unit.

If the functionality is near equivalent, what are you paying the extra for?

Apparently AC is coming out with a new kit shortly I was told on the So Cal chat help line.
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mondshine
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PostPosted: Tue Mar 06, 2018 7:12 am    Post subject: Re: CSP Disc Brake Conversion Reply with quote

HMVWNAB wrote:
I see the kit is back in stock now.

In the meantime I was reading the forums and now am wondering if it is worth the roughly $1000 price difference from the AC unit.

If the functionality is near equivalent, what are you paying the extra for?

Apparently AC is coming out with a new kit shortly I was told on the So Cal chat help line.


2 things:
1) The CSP kit is higher quality than the Chinese kits.
2) The CSP kit is the only kit available that can be used with the stock 14" Thing wheels.

On the other hand, if you are willing to switch to 15" wheels, the choice for both disc brake kits and (especially) tires is larger.
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HMVWNAB
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PostPosted: Tue Mar 06, 2018 7:20 am    Post subject: Re: CSP Disc Brake Conversion Reply with quote

I was hoping you would chime in since youíve been there, done that. Thanks!
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74 Thing
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PostPosted: Tue Mar 06, 2018 1:39 pm    Post subject: Re: CSP Disc Brake Conversion Reply with quote

I know CSP offers a vented rotor with their kits.

AC Industries does not, and CB had a black rotor that is cross drilled.
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HMVWNAB
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PostPosted: Fri Apr 06, 2018 8:23 am    Post subject: Re: CSP Disc Brake Conversion Reply with quote

Reading the disc brake install posts in the bus forum, the comment comes up that it seems to take more foot pressure to stop the car with discs.

Have you noticed this with the Thing as well?
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mondshine
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PostPosted: Fri Apr 06, 2018 7:03 pm    Post subject: Re: CSP Disc Brake Conversion Reply with quote

Actually, I have found the opposite. In fact the pedal pressure was reduced to the point that stops from low speeds would occasionally fail to actuate the (new, German) brake light switches. I have taken steps to correct this, but that's another story.
My Thing has the stock sized master cylinder (19mm?) and drum rear brakes, with stock sized wheel cylinders. I believe that only with 4 wheel disc brakes, a larger bore master cylinder is required.
My limited understanding of hydraulics tells me that a larger bore master cylinder will require more foot pressure.

I think you will be very happy with the improvement in braking performance after converting to front disc brakes. Four wheel disc brakes would be nice (no more brake adjustments), but the bang-for-the buck is with the front brakes.
Good luck, Mondshine
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hobie16
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PostPosted: Fri Apr 06, 2018 7:39 pm    Post subject: Re: CSP Disc Brake Conversion Reply with quote

mondshine wrote:
Actually, I have found the opposite. In fact the pedal pressure was reduced to the point that stops from low speeds would occasionally fail to actuate the (new, German) brake light switches. I have taken steps to correct this, but that's another story.
My Thing has the stock sized master cylinder (19mm?) and drum rear brakes, with stock sized wheel cylinders. I believe that only with 4 wheel disc brakes, a larger bore master cylinder is required.
My limited understanding of hydraulics tells me that a larger bore master cylinder will require more foot pressure.

I think you will be very happy with the improvement in braking performance after converting to front disc brakes. Four wheel disc brakes would be nice (no more brake adjustments), but the bang-for-the buck is with the front brakes.
Good luck, Mondshine

Word. I couldn't believe the difference after converting from front drums to disks. I no longer have to go to the gym to get my right leg muscles looking like an Olympic speed skater.
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