Honda AFRICA TWIN XRV750 (1987-2002) [204/291] Brakes wheels and tyres 7 19
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Honda AFRICA TWIN XRV750 (1987-2002) [204/291] Brakes wheels and tyres 7 19

Honda AFRICA TWIN XRV750 (1987-2002) [204/291] Brakes wheels and tyres 7 19

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Brakes wheels and tyres 7 19 7 Carefully pump the brake lever or pedal three or four times and hold it in front or down rear while opening the caliper bleed valve When the valve is opened brake fluid will flow out of the caliper into the clear tubing and the lever will move toward the handlebar or the pedal will move down 8 Retighten the bleed valve then release the brake lever or pedal gradually Repeat the process until no air bubbles are visible in the brake fluid leaving the caliper and the lever or pedal is firm when applied On completion disconnect the bleeding equipment then tighten the bleed valve to the torque setting specified at the beginning of the chapter and install the dust cap On models with twin front disc brakes repeat the procedure on the other caliper 9 Install the diaphragm plate and cover or cap assembly wipe up any spilled brake fluid and check the entire system for leaks It its not possible to produce a firm feel to the lever or pedal the fluid my be aerated Let the brake fluid in the system stabilise for a few hours and then repeat the procedure when the tiny bubbles in the system have settled out Also check to make sure that there are no highspots in the brake hose in which an air bubble can become trapped this will occur most often in an incorrectly mounted hose union but can also arise through bleeding the brakes while some of the brake system components are at such an angle to encourage this Reversing the angle or displacing and moving the offending component around will normally dislodge any trapped air HAYNES 11 2 Check the wheel for radial out of round runout A and axial side to side runout B 13 Disconnect the hose then tighten the bleed valve to the specified torque setting and install the dust cap 14 Top up the reservoir install the diaphragm plate and cover or cap and wipe up any spilled brake fluid Check the entire system for fluid leaks 15 Check the operation of the brakes before riding the motorcycle 11 Wheelsinspection and repair 1 Position the motorcycle on its centrestand If fitted or on an auxiliary stand When checking the front wheel support the bike so that it is raised off the ground Clean the wheels thoroughly to remove mud and dirt that may interfere with the inspection procedure or mask defects Make a general check of the wheels see Chapter 1 and tyres Renewing the fluid see Daily pre ride checks 10 Changing the brake fluid is a similar 2 To check axial side to side runout attach process to bleeding the brakes and requires a dial gauge to the fork slider or the swingarm the same materials plus a suitable tool for and position its stem against the side of the siphoning the fluid out of the hydraulic rim see illustration Spin the wheel slowly reservoir Also ensure that the container is and check the amount of runout at the rim To large enough to take all the old fluid when it is accurately check radial out of round runout Hushed out of the system with the dial gauge remove the wheel from 11 Follow Steps 3 and 5 then remove the the machine and the tyre from the wheel reservoir cap diaphragm plate and diaphragm With the axle clamped in a vice and the dial and siphon the old fluid out of the reservoir gauge positioned on the top of the rim rotate Fill the reservoir with new brake fluid then the wheel and check the runout follow Step 7 3 An easier though slightly less accurate 12 Retighten the bleed valve then release the brake lever or pedal gradually Keep the reservoir topped up with new fluid to above the LOWER level at all times or air may enter the system and greatly increase the length of the task Repeat the process until new fluid can be seen emerging from the bleed valve HAYNES HilUT Old brake fluid Is invariably much darker in colour than new fluid making it easy to see when all old fluid has been expelled from the system method is to attach a stiff wire pointer to the fork slider or the swingarm and position the end a fraction of an inch from the wheel where the wheel and tyre join If the wheel is true the distance from the pointer to the rim will be constant as the wheel is rotated Note If wheel runout is excessive check the wheel bearings and axle very carefully before replacing 4 Visually inspect the wheels for cracks flat spots on the rim and other damage Look very closely for dents in the area where the tyre bead contacts the rim 5 If damage is evident or if runout In either direction is excessive the wheel will have to be rebuilt by a professional wheel builder who will replace the damaged components with new ones then make sure the wheel is properly aligned tensioned and balanced 12 Wheelsalignment check 1 Misalignment of the wheels which may be due to a cocked rear wheel or a bent frame or fork yokes can cause strange and possibly serious handling problems If the frame or yokes are at fault repair by a frame specialist or replacement with new parts are the only alternatives 2 To check the alignment you will need an assistant a length of string or a perfectly straight piece of wood and a ruler A plumb bob or other suitable weight will also be required 3 Place the bike on the centrestand where fitted or an auxiliary stand Measure the width of both tyres at their widest points Subtract the smaller measurement from the larger measurement then divide the difference by two The result is the amount of offset that should exist between the front and rear tyres on both sides 4 If a string is used have your assistant hold one end of it about halfway between the floor and the rear axle touching the rear sidewall of the tyre 5 Run the other end of the string forward and pull it tight so that it is roughly parallel to the floor see illustration Slowly bring the string into contact with the front sidewall of the rear lyre then turn the front wheel until it is parallel with the string Measure the distance from the front tyre sidewall to the string

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