1994 MAZDA MX-5 brake

BRAKE SYSTEM P Assembly note Stop screw and O-ring 1. Push the primary piston assembly in fully. 2. Install and tighten a new O-ring and the stop screw. 3. Push and release the piston to verify that it is held by the stop screw. Stop pin and O-ring (ABS) 1. Install the secondary piston isembly with the piston hole facing the stop pin. 2. Install and tighten a new O-ring and the stop pin. 3. Push and release the piston to verify that it is held by the stop pin. Gartner Banana

P BRAKE SYSTEM k FIRST PEDAL VACUUM GAUG DEPRESSION FORCE GAUGE POWER BRAKE UNIT Quick Inspection, On-vehicle Power brake unit function check (Simple method) ii Step 1 1. With the engine stopped, depress the pedal a few times. 2. With the pedal depressed, start the engine. 3. If immediately after the engine starts the pedal moves down slightly, the unit is operating. Step 2 1. Start the engine and let it run 1 or 2 minutes. 2. Stop the engine. 3. Depress the pedal with the usual force. 4. If the first pedal stroke is long and becomes shorter with subsequent strokes, the unit is operating. 5. If a problem is found, inspect for damage or improper connection of the check valve or vacuum hose. Repair if necessary, and inspect it once again. Step 3 1. Start the engine. 2. Depress the pedal with the usual force. 3. Stop the engine with the pedal depressed. 4. Hold the pedal down for about 30 seconds. 5. If the pedal height does not change, the unit is operating. ,, 6. If there is a problem, check for damage or improper con- nection of the check valve or vacuum hose. Repair if necessary, and check once again. If the nature of the problem is still not clear after following the 3 steps above, follow the more detailed check described in "Method using tester," below. (Method using tester) Connect the SST, vacuum gauge, and pedal depression force gauge as shown in the figure. After bleeding the air from the SST, conduct the test as described in the 3 steps below. Inspection using gauges Connect the SST gauges, a vacuum gauge (A), and a pedal depression gauge (B) as shown. Bleed the air from the SST gauges before performing the following tests. a) Checking for vacuum loss Unloaded condition 1. Start the engine. 2. Stop the engine when the vacuum gauge indicates 66.7 kPa (500 mmHg, 19.7 inHg). 3. Observe the vacuum gauge for 15 seconds. If the gauge indicates 63.4-66.6 kPa (475-500 mmHg, ,, 18.7-19.7 inHg), the unit is operating. Gartner Banana

BRAKE SYSTEM P (20 kgf, 44 Ibf) (20 kgf, 44 Ibf) Loaded condition 1. Start the engine. 2. Depress the brake pedal with a force of 196 N (20 kgf, 44 Ibf). 3. With the brake pedal depressed, stop the engine when the vacuum gauge indicates 66.7 kPa I500 mmHg, 19.7 inHg). 4. Observe the vacuum gauge for 15 seconds. If the gauge indicates 63.4-66.6 kPa (475--500 mmHg, 18.7-19.7 inHg), the unit is operating. b) Checking for hydraulic pressure 1. If with the engine stopped (vacuum 0 kPa (0 mmHg, 0 inHg}) the fluid pressure is within specification, the unit is operating. 1 Pedal force Fluid pressure 2. Start the engine. Depress the brake pedal when the vac- uum reaches 66.7 kPa (500 mmHg, 19.7 inHg). If the fluid pressure is within specification, the unit is operat- ing. 1 96 N {20 kgf, 44 Ibf) I Pedal force I Fluid pressure I 1,079-1,177 kPa {I 1-1 2 kgf/cm2, 156-1 71 psi) lnspection of Check Valve 196 N {20 kgf, 44 Ibf) Note There is an arrow on the hose to indicate direction of hose installation. 5,199--5,494 kPa {53-56 kgf/cm2, 754--796 psi} lnspection 1. Disconnect both ends of the vacuum hose. 2. Apply suction and pressure to the hose from the engine side. Verify that air flows only toward the engine. If air passes in both directions or not at all, replace the vac- uum hose (along with the check valve). Gartner Banana

P BRAKE SYSTEM Removal / Installation 1. Remove in the order shown in the figure. 2. Install in the reverse order of removal. 3. Take the following steps after installation: (1) Check and adust the push rod and piston clearance. (Standard: refer to page P-12 1 ABS: refer to page P-15.) (2) Add fluid and bleed the air. (Refer to page P-7.) (3) Check all parts for fluid leakage. (4) Check and adjust the brake pedal height and free play. (Refer to page P-9.) (5) Make an on-vehicle check of the unit. (Refer to page P-20.) (6) Check that the vacuum hose does not contact other parts. ABS 1~22 (1.3--2.2,~.&16} STANDARD 35UOPX-01 1. Fluid level sensor connector 5. Clevis tin 2. Brake pipe and proportioning bypass valve 6. Power 'brake unit 3. Master cylinder 7. Gasket 4. Vacuum hose with check valve Apply sealant to the gasket contact surface Gartner Banana

BRAKE SYSTEM P MASTER CUUNDER PRESSURE kPa #gflcm2, psi) 15UOPX-025 Replacement PROPORTIONING BYPASS VALVE Inspection When disconnecting and connecting the brake pipes, do so by using the flare nut wrench SST. 1. Connect the SST and the adapters to the brake pipes as shown in the figure. 2. Bleed the air from the brake system. (Refer to page P-7.) 3. Measure the fluid pressure from the master cylinder and to the rear brakes. If not as specified, replace the valve assembly. Specification 4. Add brake fluid and bleed the air. (Refer to page P-7.) 5. Check the brake lines for fluid leakage. Fluid pressure kPa (kgf/cm2, psi) Caution Brake fluid will damage painted surfaces. If brake fluid does get on a painted surface, wipe it off immediately. A A' I B 1. Remove in the order shown in the figure, referring to Removal Note. 2. Install in the reverse order of removal, referring to lnstallation Note. 3. After installation: (1) Add brake fluid and bleed the air. (Refer to page P-7.) (2) Check the brake lines for fluid leakage. 6' 1. Brake pipe 2. Bolt Removal Note ............... page P-24 3. Proportioning bypass valve Installation Note ............. page P-24 Gartner Banana

BRAKE SYSTEM Removal I Installation note Brake pipe Caution ,..- Brake fluid will damage painted surfaces. If brake fluid does get on a painted surface, wipe it off im- mediately. 1. Modify the brake pipe tightening torque to allow for use of a torque wrench-SST combination. (Refer to section GI) "Torque Formulas" 2. Disconnect/connect the brake pipes by using the SST. 3. Tighten the brake pipe by using the SST. Tightening torque: 13-22 N-m (1 3-2.2 kgf-m, 9.4-1 6 ftslbf) Gartner Banana

BRAKE SYSTEM P FRONT BRAKE (DISC) Quick Inspection, On-vehicle Disc pad 1. On level ground, jack up the front of the vehicle and sup- port it with safety stands. 2. Remove the wheels. 3. Sight through the caliper inspection hole and verify the remaining thickness of the pad. Thickness: 1 .Omm (0.04 in) min. I I 05UOPX-034 Replacement (Disc pad) 1. Remove in the order shown in the figure, referring to Removal Note. 2. Install in the reverse order of removal, referring to Installation Note. 1. Lock bolt 3. Outer shim Removal Note ................... below 4. Inner shim 2. Disc pad 5. Guide plate Installation Note ............. page P-26 Removal note Lock bolt 1. Remove the lower lock bolt. 2. Rotate the caliper upward and support it with a piece of rope. Gartner Banana

P BRAKE SYSTEM Installation note Disc pad 1. Push the piston inward by using the 2. Install the new pads in the mounting SST. support. 1 I 15UOPX-030 Removal I lnstallation (Caliper) 1. On level ground, jack up the front of the vehicle and support it with safety stands. 2. Remove the wheels; then remove components in the order shown in the figure. 3. Install in the reverse order of removal. 4. Tighten all nuts and bolts to the specified torques, referring to the figure. 1. Brake hose 5. Shim 2. Connecting bolt 6. Bolt 3. Caliper 7. Mounting support Disassembly / Inspection / 8. Disc plate Assembly .................. page P-28 Inspection ................... page P-27 4. Disc pad ................... Inspection page P-27 Gartner Banana