BOSCH BC1846 QuietCast Premium Ceramic Disc Brake Pad Set - Rear Instruction Manual

1. Product Overview

The Bosch QuietCast BC1846 Premium Ceramic Disc Brake Pad Set is engineered for the rear axle of select Mazda CX-5 vehicles. This set provides OE quality performance, durability, and quiet operation with low dust. It features Bosch's exclusive Molded Shim Technology (MST) and pre-attached OE style multilayer rubber core shims for enhanced noise reduction and corrosion resistance. The ceramic friction material is designed for robust performance and exceptional stopping power.

Key Features:

• OE Quality Performance: Engineered to meet original equipment standards for braking excellence.
• Quiet Operation: Features pre-attached OE style multilayer rubber core shims for reduced noise.
• Low Dust Ceramic Formula: Proprietary ceramic friction material ensures clean wheels and consistent stopping power.
• Corrosion Resistance: Powder-coated backing plates prevent rust and corrosion, extending product life.
• Complete Set: Includes pads for one axle (two wheels), necessary hardware kit, and synthetic lubricant.

Image 1: Bosch BC1846 QuietCast Rear Ceramic Disc Brake Pad Set, showing four pads, various hardware clips, and a packet of synthetic lubricant.

2. Installation and Setup

Installation of brake components requires specialized tools and knowledge. It is highly recommended that installation be performed by a qualified automotive technician. Improper installation can lead to brake system failure, serious injury, or death.

General Installation Steps (Professional Installation Recommended):

1. Safety First: Ensure the vehicle is securely lifted and supported. Disconnect the battery if working near electrical components.
2. Remove Old Pads: Carefully remove the wheel, brake caliper, and old brake pads. Note the orientation of any clips or shims.
3. Inspect Components: Inspect brake rotors, calipers, and other brake system components for wear or damage. Replace as necessary.
4. Clean Caliper: Clean the caliper and caliper bracket thoroughly, removing any rust or debris.
5. Lubricate: Apply the provided synthetic lubricant to all sliding contact points, such as caliper pins and the back of the brake pads where they contact the caliper. Avoid getting lubricant on the friction material.
6. Install New Hardware: Install the new hardware clips onto the caliper bracket. Pay attention to the numbering on small clips (e.g., #1 & #2) and match the orientation of the original clips.
7. Install New Pads: Insert the new Bosch QuietCast brake pads into the caliper bracket. Ensure they fit correctly and move freely.
8. Reassemble: Reinstall the brake caliper and wheel. Torque all fasteners to the manufacturer's specifications.
9. Bleed Brakes (if necessary): If the brake lines were opened or air entered the system, bleed the brakes according to the vehicle manufacturer's procedure.
10. Test Brakes: Before driving, pump the brake pedal several times until it feels firm. Perform initial test drives at low speeds in a safe area.

Image 2: Another view of the Bosch BC1846 brake pads and hardware, showing the backing plates and friction material.

Image 3: Close-up view of the Bosch BC1846 brake pads and hardware components.

3. Operating Instructions

Brake Pad Break-In Procedure:

Proper break-in (also known as bedding-in) of new brake pads is crucial for optimal performance and longevity. This process helps to transfer a thin layer of friction material to the rotor surface, ensuring consistent braking and reducing noise.

1. Initial Stops: Perform 10-15 moderate stops from approximately 30 mph (50 km/h) down to 5 mph (8 km/h). Avoid coming to a complete stop.
2. Cool Down: Drive for several minutes without using the brakes to allow them to cool down.
3. Avoid Hard Braking: For the first 200 miles (320 km) after installation, avoid sudden, hard braking or prolonged heavy braking. This allows the pads to fully seat with the rotors.

During the break-in period, you may notice a slight odor or reduced braking performance. This is normal. If you experience excessive smoke, burning smell, or significantly reduced braking, pull over safely and inspect the brakes or consult a professional.

4. Maintenance

Regular inspection and maintenance of your vehicle's braking system are essential for safety and performance. It is recommended to have your brakes inspected at least once a year or every 12,000 miles (20,000 km), or as specified by your vehicle manufacturer.

Maintenance Checks:

• Brake Pad Wear: Check the thickness of the brake pads. Replace them when they reach their minimum wear limit (typically 2-3mm).
• Rotor Condition: Inspect rotors for excessive wear, scoring, cracks, or warping. Replace or resurface rotors as needed.
• Brake Fluid Level: Check the brake fluid level in the reservoir. Low fluid can indicate a leak or worn pads.
• Brake Fluid Quality: Brake fluid absorbs moisture over time, which can reduce braking efficiency. Have the fluid checked and replaced according to your vehicle's maintenance schedule.
• Caliper Operation: Ensure calipers are moving freely and not sticking.
• Hoses and Lines: Inspect brake hoses and lines for cracks, leaks, or damage.

5. Troubleshooting

If you experience any issues with your braking system, consult a qualified technician immediately. Do not attempt to diagnose or repair complex brake problems without proper training and tools.

6. Specifications

7. Warranty Information

Bosch Brake Components LLC (BBC) warrants all BBC Brake Products to be free from defects in materials and workmanship from the date of purchase by the original verified purchaser from an authorized installer or retailer. If the BBC Brake Product is found to be defective in material or workmanship, BBC will replace the defective product with another BBC Brake Product. This warranty is not transferable.

This warranty does not cover any loss due to misuse, alteration, accident, abuse, neglect, normal wear, or improper installation of the products. It applies only to BBC Brake Products installed on passenger cars, vans, and light trucks. It does not apply to products installed on vehicles or equipment used for towing, racing, public service, security, government, off-highway recreational, off-highway competition, off-highway equipment, fleet or commercial purposes, or if used in any aircraft/aviation, marine, agriculture, or industrial applications.

The warranty does not cover any loss or liability for incidental or consequential damages that may be caused by a breach of this written warranty. No other warranty, express or implied, shall exist. BBC expressly disclaims, without limitation, the implied warranties of merchantability and of fitness for a particular purpose. The foregoing states BBC’s entire and exclusive liability and the buyer’s exclusive and sole remedy for any damages or claims made in connection with the sale of a BBC Brake Product. BBC shall in no event be liable for any special, incidental, or consequential damages whatsoever, except those specifically provided for in this warranty.

8. Support and Resources

For further assistance, technical support, or warranty claims, please contact Bosch Automotive customer service or visit their official website. Always refer to your vehicle's service manual for specific procedures and torque specifications.

Helpful Resources:

• Official Bosch Automotive Website: www.boschautoparts.com
• Professional Automotive Technician: Consult a certified mechanic for installation or complex diagnostics.