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| after struggling with getting the parking brakes on my Spra Coupe 216 and now my Spra Coupe 3430 to worked, i came up with this fix for the 3430. I remove the old Tolomatic mechanical/hydraulic brake calipers and installed just hydraulic Tolomatic brakes calipers that I go off of Ebay. These calipers where made for the 1/4 inch thick disc's that are on the 3430. I built a bracket and mounted these in a fixed position and then I removed the inside snap ring on the disc so now it floats. The other brakes calipers where mount on pins and floated and the disc's where fixed. I then spliced in 2 Biondo Racing brake linelocks in the brake lines. I then installed a lighted switch and Surplus Center buzzer with a light in the cab to control the brake linelocks. The buzzer is loud enough to hear over the engine and other noise. Pros and cons...pros...no more worries about trying to adjust the parking brake any more, just depress the brakes and hit the switch and the brakes are locked on. Hit the switch again and the brakes release. Cons...you parking brake is dependent on electrical power, so if the power fails, you lose your parking brake. Or if you have a small leak somewhere in the brake lines after the linelocks the brakes will bleed off slowly. So far neither of these have been an issue for me. I tested the linelocks on my bench for an hour with power on and they did not even get warm to the touch, they only pulled about 2 amps together..
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 IMG_0108.jpg (57KB - 863 downloads)
IMG_0109.jpg (65KB - 941 downloads)
IMG_0111.jpg (60KB - 859 downloads)
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brake mod to Spra Coupe 3430
