09/06/2021
The question of whether a motorcycle, specifically the 1981 Yamaha Virago 750, is equipped with a rear brake is a fundamental one for any owner or prospective buyer. Understanding the braking systems of any vehicle is paramount to ensuring safe operation and predictable performance. This article will delve into the specifics of the Virago 750's braking setup, confirming the presence of a rear brake and exploring its significance, maintenance, and common considerations.
Confirming the Rear Brake on the 1981 Yamaha Virago 750
To put it plainly, yes, the 1981 Yamaha Virago 750 absolutely has a rear brake. Like the vast majority of motorcycles produced since the advent of modern motorcycling, the Virago 750 is equipped with both a front and a rear braking system. These two systems work in conjunction to provide the rider with the necessary stopping power to safely control the motorcycle in various conditions. The rear brake on the Virago 750 is typically operated by a foot lever located on the right-hand side of the motorcycle, near the rider's right foot.
The Importance of a Functional Rear Brake
The rear brake, while often less powerful than its front counterpart, plays a crucial role in overall braking efficiency and motorcycle stability. Here's why it's so important:
- Balanced Braking: Utilizing both front and rear brakes provides the most effective and balanced stopping power. The front brake generally accounts for a larger percentage of the stopping force (often around 70-80%), but the rear brake contributes significantly to slowing the motorcycle down and preventing the front wheel from locking up under heavy braking.
- Stability: Applying the rear brake can help to stabilize the motorcycle during braking, especially when cornering. It can prevent the rear end from becoming unsettled and potentially leading to a skid.
- Reduced Wear on Front Brakes: By sharing the braking load, the rear brake helps to reduce the strain and wear on the front brake components, potentially extending their lifespan.
- Emergency Stops: In emergency situations, having a fully functional rear brake can be the difference between a controlled stop and a loss of control.
Components of the Virago 750 Rear Brake System
The rear braking system on the 1981 Yamaha Virago 750 is a drum brake system. Drum brakes, while less common on modern motorcycles which often feature disc brakes, were standard for many bikes of this era. The key components include:
| Component | Description | Function |
|---|---|---|
| Brake Drum | A cylindrical metal housing attached to the rear wheel hub. | Provides the surface against which the brake shoes press. |
| Brake Shoes | Curved, friction-lined pads that pivot outwards. | When applied, they press against the inner surface of the brake drum to create friction and slow the wheel. |
| Brake Cam | A rotating shaft with an eccentric lobe. | As it rotates, it forces the brake shoes outwards against the drum. |
| Brake Pedal | The lever operated by the rider's foot. | Initiates the braking action by actuating the brake cam. |
| Brake Rod/Cable | Connects the brake pedal to the brake cam mechanism. | Transmits the force from the pedal to the cam. |
Maintenance and Common Issues
Like any part of a motorcycle, the rear brake system requires regular inspection and maintenance to ensure it functions correctly and safely. Neglecting these can lead to reduced braking performance or even failure.
Regular Checks:
- Brake Pedal Free Play: Ensure there is a small amount of free play in the brake pedal before it starts to engage the brake. Too little play can cause the brake to drag, leading to overheating and premature wear. Too much play indicates that the brake shoes are worn or the linkage needs adjustment.
- Brake Drum and Shoes: Periodically, the brake drum and shoes should be inspected for wear. The friction material on the brake shoes will wear down over time. If the shoes are worn beyond their service limit, they must be replaced. The inside of the brake drum should also be checked for scoring or glazing, which can reduce braking effectiveness.
- Lubrication: The brake pedal pivot point and any linkages should be kept clean and lightly lubricated to ensure smooth operation.
- Brake Rod Adjustment: The tension of the brake rod may need adjustment over time as the brake shoes wear. Refer to the owner's manual for the correct procedure and specifications.
Common Problems and Solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Weak Braking | Worn brake shoes, glazed drum, improper adjustment, contamination (oil/grease on shoes or drum). | Replace brake shoes, clean or replace drum if damaged, adjust linkage, clean brake components thoroughly. |
| Brake Dragging | Insufficient pedal free play, bent brake rod, seized brake cam. | Adjust pedal free play, straighten or replace brake rod, clean and lubricate or replace brake cam. |
| Spongy Pedal Feel | Air in the brake line (more common on disc brakes, but can occur with hydraulic drum systems if present), worn brake cam mechanism. | Bleed the brake system if applicable, check and lubricate brake cam. |
| Noisy Braking (Squealing/Grinding) | Glazed brake shoes or drum, foreign debris, worn brake shoes reaching the wear indicator. | Clean or replace components, inspect for debris, replace worn brake shoes. |
How to Adjust the Rear Brake
Adjusting the rear brake on your Virago 750 is a relatively straightforward process, but it's crucial to follow the correct procedure to ensure safety and optimal performance. Always consult your owner's manual for specific instructions and torque values.
- Locate the Adjustment Point: The primary adjustment is usually made via a threaded rod or cable connected to the brake pedal linkage or directly to the brake arm on the drum.
- Check for Free Play: Before making any adjustments, check the existing free play in the brake pedal. Push the pedal with your foot until you feel resistance. The distance it moves before resistance is the free play.
- Make Adjustments:
- To Increase Free Play (if too tight): Loosen the locknut and turn the adjustment nut or rod away from the brake cam mechanism.
- To Decrease Free Play (if too loose): Tighten the locknut and turn the adjustment nut or rod towards the brake cam mechanism.
- Re-check Free Play: After adjusting, re-check the pedal free play. The goal is to achieve the manufacturer's specified free play (often around 20-30mm of pedal travel at the toe).
- Test the Brake: Gently apply the brake pedal to ensure it engages smoothly and that the brake does not drag when released.
- Secure the Adjustment: Once satisfied, tighten the locknut to secure the adjustment.
Important Note: If the adjustment mechanism is at its limit and you still cannot achieve the correct free play, it is a strong indication that the brake shoes are worn out and need replacement.
Frequently Asked Questions
Q1: Can I ride my Virago 750 without a rear brake?
A1: While technically possible to ride, it is extremely dangerous and strongly discouraged. Riding without a functional rear brake severely compromises your ability to stop safely, increasing the risk of accidents.
Q2: How often should I check my rear brake?
A2: It's recommended to check your rear brake's operation (pedal feel, engagement) before every ride. A more thorough inspection of the brake shoes and drum should be done at regular service intervals, typically every few thousand miles or annually, as specified in your owner's manual.
Q3: My rear brake feels weak. What could be the problem?
A3: A weak rear brake is most commonly caused by worn brake shoes, but could also be due to an improperly adjusted linkage, a glazed brake drum, or contamination of the brake surfaces with oil or grease.
Q4: Is it normal for the rear brake to make a slight noise?
A4: A very faint, occasional noise might be considered normal, but loud squealing, grinding, or persistent rubbing indicates a problem that needs immediate attention. This could be worn shoes, debris, or a poorly adjusted brake.
Q5: Where can I find parts for my Virago 750's rear brake?
A5: You can typically find replacement brake shoes, drums, and associated parts at reputable motorcycle parts suppliers, online retailers specializing in vintage Japanese motorcycles, or through authorized Yamaha dealerships.
Conclusion
In summary, the 1981 Yamaha Virago 750 is indeed equipped with a rear brake, a vital component for safe and effective motorcycle operation. Understanding its function, performing regular maintenance, and addressing any issues promptly will ensure that your Virago 750 remains a reliable and enjoyable machine to ride. Always prioritize safety and consult your owner's manual or a qualified mechanic if you have any doubts about your motorcycle's braking system.
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