Press the piston squarely into the bore by hand or with a suitable clamp until it bottoms out. Refit the bleed screw and reconnect the brake line. Torque mounting bolts to 35 Nm (26 lb-ft). Bleed the brake circuit following Section 4.92.
Toyota’s legendary FJ40 used 4.11 and 4.56 ratios commonly, but some non-USA market diesels and special-order off-road packages received 4.88 or 4.89 aftermarket conversion gears. A Haynes manual covering the Land Cruiser (1970-1980) is a prime resource for this setup.
Brake caliper overhaul – rear (continued)
The vehicle vibrates violently at 45 mph. Solution: This is rarely the gears. With 4.89 ratios, driveshaft speed doubles. Your driveshaft may need high-speed balancing or a double-cardan joint.
Chemical ProcessingIn industrial heaters and chemical reactors that handle corrosive gases at white-hot temperatures, Haynes 4.89 provides the longevity required to avoid frequent, expensive shutdowns.
Nickel (20-24%): Stabilizes the face-centered cubic structure and improves ductility.
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The Samurai is the king of the 4.89 ratio. Many factory Samurais came with a 3.73 or 4.30, but the aftermarket explosion for 31-inch tires made the 4.89 the gold standard. A Haynes manual for the Suzuki Samurai dedicates significant space to setting up 4.89 ring and pinions due to the fragile, lightweight nature of the Samurai’s differential.
First, a critical clarification. "Haynes" is not a manufacturer of differential gears. In automotive circles, Haynes refers to the —the iconic repair manuals found in garages worldwide. Therefore, "Haynes 4.89" most commonly refers to a specification or a repair procedure listed within a Haynes manual for a vehicle that utilizes a 4.89:1 differential gear ratio .
Examine the piston for scoring, pitting, or corrosion. If any marks are visible on the sealing surface, replace the piston. Similarly, check the caliper bore — light corrosion may be removed with fine wet-and-dry paper (800-grit) soaked in brake fluid, but deep pitting requires caliper replacement.
