Brakes
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In general, there are two types of calipers, floating and fixed. | In general, there are two types of calipers, floating and fixed. | ||
| − | FLOATING | + | *FLOATING |
Usually have, one or two pistons located on the inboard side of the calipers and squeeze the pads against the turning rotor using a thru-bolt as a guide for the pads. | Usually have, one or two pistons located on the inboard side of the calipers and squeeze the pads against the turning rotor using a thru-bolt as a guide for the pads. | ||
| − | FIXED | + | *FIXED |
As the name implies are fixed and do not move. they are located along the caliper body on either side and there may be as many as six pistons that apply pressure to the pads. They are usually a high performance type of brake, IE. Baer. | As the name implies are fixed and do not move. they are located along the caliper body on either side and there may be as many as six pistons that apply pressure to the pads. They are usually a high performance type of brake, IE. Baer. | ||
| − | ''' | + | '''Rotors''' |
[[Image:Disk_brake_close_up.jpg]] | [[Image:Disk_brake_close_up.jpg]] | ||
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Many asked about the cross drilled rotors and how they help cool the brake system. Well here is the short answer, air cools them, and without ducting running to your brake discs they are hardly more effective than your standard ventilated disc. The slotted rotors are for gassing, when the pads reach their operating temps or higher they start to gas or breakdown and the slots are there to allow the gas to escape. | Many asked about the cross drilled rotors and how they help cool the brake system. Well here is the short answer, air cools them, and without ducting running to your brake discs they are hardly more effective than your standard ventilated disc. The slotted rotors are for gassing, when the pads reach their operating temps or higher they start to gas or breakdown and the slots are there to allow the gas to escape. | ||
| − | [[Image:Disc_vented. | + | [[Image:Disc_vented.jpg|frame|none|Vented disc rotor]] |
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| + | [[Image:Slotted_vented.gif|frame|none|slotted - vented disc]] | ||
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| + | [[Image:Slotted_x_drilled.jpg|frame|none|slotted and drilled disc]] | ||
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So what cross drilled rotors do is reduce surface area decrease co-efficient of friction and are more prone to thermal shock, and cracking unless, you have a specialized braking system using, special brake fluid, stainless steel brake lines, venting all the necessary items to aid in convection | So what cross drilled rotors do is reduce surface area decrease co-efficient of friction and are more prone to thermal shock, and cracking unless, you have a specialized braking system using, special brake fluid, stainless steel brake lines, venting all the necessary items to aid in convection | ||
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As far as cross drilled rotors go, the advent of carbon metallic friction materials with their increased temperatures and thermal shock characteristics ended the day of the drilled disc in professional racing. Typically in original equipment road car applications these holes are cast then finished machined to provide the best possible conditions by which to resist cracking in use. But they will crack eventually under the circumstances described in another section. Properly designed, drilled discs tend to operate cooler than non-drilled ventilated discs of the same design due the higher flow rates through the vents from the supplemental inlets and increased surface area in the hole. That's right, inlets, the flow is into the hole and out through the vent to the OD of the disc. If discs are to be drilled, the external edges of the holes must be chamfered (or, better yet, radiused) and should also be peened. | As far as cross drilled rotors go, the advent of carbon metallic friction materials with their increased temperatures and thermal shock characteristics ended the day of the drilled disc in professional racing. Typically in original equipment road car applications these holes are cast then finished machined to provide the best possible conditions by which to resist cracking in use. But they will crack eventually under the circumstances described in another section. Properly designed, drilled discs tend to operate cooler than non-drilled ventilated discs of the same design due the higher flow rates through the vents from the supplemental inlets and increased surface area in the hole. That's right, inlets, the flow is into the hole and out through the vent to the OD of the disc. If discs are to be drilled, the external edges of the holes must be chamfered (or, better yet, radiused) and should also be peened. | ||
| − | ''' | + | '''Drum brakes''' |
| + | [[Image:Drum_brake.gif|frame|none|Internal drum brake illustration]] | ||
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