BRAKE THEORY AND HYDRAULIC CLUTCH |
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One of the most asked questions , when building a trike, concerns the brakes. Most of the Stopping power in a cage is in the front brakes. When you don't have two-front brakes what is best for a trike? On this page you will find some answers to your questions. This page will also link you to other's web sites that contain information on how others handled the problem. |
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The ratio of the diameter of the plunger in the master cylinder to the diameter of the piston in the slave or wheel cylinder has EVERYTHING to do with braking. If the diameter of the plunger in the master cylinder is greater than the diameter of the piston in the wheel cylinder you won't have any brakes because you have no advantage. Also the distance between the pivot point of the brake pedal to the footpad is very important. The longer the pedal the more mechanical advantage you have. The bore of the master cylinder should always be smaller than the bore of the slave cylinder. You pick up the extra fluid to operate more than one wheel cylinder by the simple fact that the stroke of the master cylinder is much much more than that of the slave cylinder. The rear brakes of a VW are weak at best. If everything is not just right they don't exist. |
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Simple Examples of pedal leverage |
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It's no secret that when you build a trike you must change the braking bias from the front to the rear. One way to do do this is to install type 3 rear drums on your type 1. If your like the rest of us you go down to the VW parts outlets or hunt through the wrecking yards for the parts and pieces. You will want to use 22mm wheel cylinders. Wider 40mm-wide linings can be used at the rear to increase lining durability and fade resistance. The largest rear wheel cylinders available for a Beetle are the 19mm units used in '58 - '67 models, so many racers substitute 22mm front wheel cylinders from a '65-or-later Beetle. The 40mm-wide rear shoes can be adapted from any '68-or-later Beetle. To make the swap complete, use '68-or-later rear backing plates. The best rear brake system, without resorting to costly disc brake setups, is an adaptation of the rear brake assembly from a '65-or-earlier VW Type-3 squareback, notchback or fast-back. Actually, linings and wheel cylinders can be used off any year Type-3. But to get the more desirable 5-bolt wheel-lug pattern, you must use a '65-or-earlier rear brake drum.
MASTER CYLINDERs I have had good luck using the 5/8ths master cylinders with this set up. All else being equal, a larger master cylinder requires more pedal effort. If you get carried away and install too large a master cylinder, pedal effort may become too high. This will become very apparent to your leg after a few hours of driving.
T For more information concerning Type 1 to Type 3 rear brake conversion click here
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CLICK ON PICS TO GO TO JEGGS |
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Another good way to make your pedals |
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At first I used a hand throttle, like a standard m/c. My wrist grew tired holding it open after awhile so I switched to a floor throttle as shown below. These can be purchased from Speedway motors. The Throttle assembly kit sold includes a cable with a 48 inch length. If that isn't long enough for you they sell the cables in 60 inch, 72 inch, 84 inch, and 96 inch lengths at an extra cost. (see catalog) |
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Click on pic to go to catalog. Click on search part number and type in (P/N 720-4103) for the kit. PN 720-4128 for the 60" cable, 720-4129 for the 72" cable, 720-4130 for the 84" cable and 720-4131 for the 96" cable. |
I needed just the cable w/o the casing and hardware. It is a .080 7/19 strand cable. I went down to our local marine store (West Marine) and they had the exact cable I needed: Flexible Stainless Steel Wire Exceptionally strong Loos wire rope is developed and perfected for sailboat applications. Each strand is preformed and polished to eliminate wire's tendency to collect carbon particles and become brittle. They had many sizes to choose from. So if your looking for cable for your tirke check out your local marine supply store or go to WEST MARINE and order from their catalong (Type Flexible Stainless Steel Wire in the search box and then when asked for the department click on sail boat hardware)
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