Releases Tension on Both Large and Small GM Single Spring Brakes During Servicing. Many GM brakes use a heavy single spring. The 50600 engages the spring and quickly releases the spring tension. The brake can then be disassembled to replace brake shoes, emergency brake cable or service the brake cylinder. Also works on older C & H body vehicles with single brake springs. Applications Smaller Spring: 1991 to current GM H Body, 1992 to current GM C & H Body, Bonneville, LaSabre, Buick Electra, Delta 88, Olds 88, 1995 to current Chevrolet Lumina & Monte Carlo, Cadillac Fleetwood, Cadillac DeVille, Chevrolet Lumina APV, Pontiac Trans Sport, Olds SilhouetteLarger Spring: 2005 to current Chevrolet Silverado, 2004 to current Chevrolet Colorado Including 2007 Models